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Awesome

An open API service indexing awesome lists of open source software.

awesome-cpp

A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny things. Inspired by awesome-... stuff.
https://github.com/fffaraz/awesome-cpp

Last synced: about 12 hours ago
JSON representation

  • Other Awesome Projects

  • Cryptography

    • Themis - crypto library for painless data security, providing symmetric and asymmetric encryption, secure sockets with forward secrecy, for mobile and server platforms. [Apache2]
    • Bcrypt - A cross platform file encryption utility. Encrypted files are portable across all supported operating systems and processors. [BSD]
    • BeeCrypt - A portable and fast cryptography library. [LGPLv2.1+]
    • Botan - A crypto library for C++. [BSD-2]
    • GnuPG - A complete and free implementation of the OpenPGP standard. [GPL]
    • Libgcrypt - A general purpose cryptographic library originally based on code from GnuPG. [LGPLv2.1+]
    • LibreSSL - A free version of the SSL/TLS protocol forked from OpenSSL in 2014. [?]
    • Nettle - A low-level cryptographic library. [LGPL]
    • OpenSSL - A robust, commercial-grade, full-featured, and Open Source cryptography library. [Apache] [website](http://www.openssl.org/)
    • libsodium - P(ortable|ackageable) NaCl-based crypto library, opinionated and easy to use. [ISC]
    • Crypto++ - A free C++ class library of cryptographic schemes. [Boost] [website](http://www.cryptopp.com/)
    • LibTomCrypt - A fairly comprehensive, modular and portable cryptographic toolkit. [WTFPL]
    • retter - A collection of hash functions, ciphers, tools, libraries, and materials related to cryptography.
    • Tiny AES in C - Small portable AES128/192/256 in C. [PublicDomain]
    • sha1collisiondetection - Library and command line tool to detect SHA-1 collision in a file. [MIT]
    • digestpp - C++11 header-only message digest (hash) library. [PublicDomain]
    • libhydrogen - A lightweight, secure, easy-to-use crypto library suitable for constrained environments. [ISC]
    • mbedTLS - An open source, portable, easy to use, readable and flexible SSL library, previously known as PolarSSL. [Apache2] [website](https://tls.mbed.org/)
    • Tink - A multi-language, cross-platform library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse. [Apache-2.0]
    • s2n - An implementation of the TLS/SSL protocols. [Apache]
    • Bcrypt - A cross platform file encryption utility. Encrypted files are portable across all supported operating systems and processors. [BSD]
    • BeeCrypt - A portable and fast cryptography library. [LGPLv2.1+]
    • Libgcrypt - A general purpose cryptographic library originally based on code from GnuPG. [LGPLv2.1+]
    • Nettle - A low-level cryptographic library. [LGPL]
    • HEhub - A library for homomorphic encryption and its applications. [Apache2]
    • GnuTLS - A secure communications library implementing the SSL, TLS and DTLS protocols. [LGPL2.1]

  • Static Code Analysis

    • Infer - A static analyzer for Java, C and Objective-C. [BSD]
    • Cppcheck - A tool for static C/C++ code analysis. - [source](https://github.com/danmar/cppcheck)
    • CppDepend - Simplifies managing a complex C/C++ code base by analyzing and visualizing code dependencies, by defining design rules, by doing impact analysis, and comparing different versions of the code.
    • OCLint - A static source code analysis tool to improve quality and reduce defects for C, C++ and Objective-C. - [source](https://github.com/oclint/oclint)
    • Clang Static Analyzer - A source code analysis tool that finds bugs in C, C++, and Objective-C programs.
    • Linticator - Eclipse CDT integration of Pc-/FlexeLint.
    • List of tools for static code analysis - A list of tools for static code analysis from Wikipedia.
    • Trunk - Toolkit to check, test, merge, and monitor code.
    • include-what-you-use - A tool for use with clang to analyze includes in C and C++ source files. [website](https://include-what-you-use.org/)
    • cpp-dependencies - Tool to check C++ #include dependencies (dependency graphs created in .dot format). [Apache]
    • cpplint - A C++ style checker following Google's C++ style guide.
    • IKOS - Static analyzer for C/C++ based on the theory of Abstract Interpretation. [NOSA 1.3]
    • Linticator - Eclipse CDT integration of Pc-/FlexeLint.
    • OptView2 - Inspect missed Clang optimizations.
    • OCLint - A static source code analysis tool to improve quality and reduce defects for C, C++ and Objective-C. - [source](https://github.com/oclint/oclint)
    • Clang Static Analyzer - A source code analysis tool that finds bugs in C, C++, and Objective-C programs.
    • Trunk - Toolkit to check, test, merge, and monitor code.
    • PVS-Studio - A tool for bug detection in the source code of programs, written in C, C++ and C#.

  • Integrated Development Environment

    • Microsoft Visual Studio - An IDE from Microsoft.
    • KDevelop - A free, open source IDE.
    • Anjuta DevStudio - The GNOME IDE. [GPL3]
    • Cevelop - Cross-platform C and C++ IDE based on Eclipse CDT with additional plug-ins.
    • Dev-C++ - A portable C/C++/C++11 IDE.
    • Eclipse CDT - A fully functional C and C++ IDE based on the Eclipse platform.
    • IBM VisualAge - A family of computer integrated development environments from IBM.
    • C Playground - Online C Programming IDE - An online IDE to practice C Programming where you can write, edit, and run code online.
    • YouCompleteMe - YouCompleteMe is a fast, as-you-type, fuzzy-search code completion engine for Vim.
    • Microsoft Visual Studio Code - An open-source IDE from Microsoft. [MIT] [website](https://code.visualstudio.com)
    • rtags - A c/c++ client/server indexer with for integration with emacs based on clang.
    • Qt Creator - A cross-platform C++, JavaScript and QML IDE which is part of the SDK for Qt. [GPL3 with exceptions] [website](https://www.qt.io/product/development-tools)
    • color_coded - A vim plugin for libclang-based highlighting. [MIT]
    • Embarcadero Dev-CPP - A fork of Dev-C++ that comes preinstalled with new themes and modern compilers. [GPLv2] [website](https://www.embarcadero.com/free-tools/dev-cpp)
    • Irony-mode - A C/C++ minor mode for Emacs powered by libclang.
    • Xcode - Developed by Apple.
    • Cevelop - Cross-platform C and C++ IDE based on Eclipse CDT with additional plug-ins.
    • AppCode - an IDE for Objective-C, C, C++, and JavaScript development built on JetBrains’ IntelliJ IDEA platform.
    • CLion - Cross-platform C and C++ IDE from JetBrains.
    • Dev-C++ - A portable C/C++/C++11 IDE.
    • Eclipse CDT - A fully functional C and C++ IDE based on the Eclipse platform.
    • CodeLite - Another cross-platform, free C and C++ IDE. [GPL2 with an exception for plugins]
    • juCi++ - Cross-platform, lightweight C++ IDE with libclang integration. [MIT]
    • KDevelop - A free, open source IDE.
    • Microsoft Visual Studio - An IDE from Microsoft.
    • cquery - A C++ code completion engine for vscode, emacs, vim, etc.

  • Frameworks

    • Qt - A cross-platform application and UI framework. [GPL/LGPL/Proprietary] [website](https://www.qt.io)
    • APR - Apache Portable Runtime. Another library of cross-platform utility functions. [Apache2]
    • GLib - GLib provides the core application building blocks for libraries and applications written in C. [LGPL]
    • Apache C++ Standard Library - STDCXX, A collection of algorithms, containers, iterators, and other fundamental components. [retired] [Apache2]
    • ASL - Adobe Source Libraries provides peer-reviewed and portable C++ source libraries. [MIT]
    • Boost - A large collection of generic C++ libraries. [Boost] [website](https://www.boost.org)
    • Cinder - A community-developed, free and open source library for professional-quality creative coding. [BSD]
    • Cxxomfort - A small, header-only library that backports various facilities from more recent C++ Standards to C++03 and later. [MIT]
    • Loki - A C++ library of designs, containing flexible implementations of common design patterns and idioms. [MIT]
    • Reason - A cross platform framework designed to bring the ease of use of Java, .Net, or Python to developers who require the performance and strength of C++. [GPL2]
    • ROOT - A set of OO frameworks with all the functionality needed to handle and analyze large amounts of data in a very efficient way. Used at CERN. [LGPL]
    • STLport - An exemplary version of STL. [Free]
    • STXXL - Standard Template Library for Extra Large Data Sets. [Boost]
    • Ultimate++ - A C++ cross-platform rapid application development framework. [BSD]
    • Windows Template Library - A C++ library for developing Windows applications and UI components. [Public]
    • Dlib - A toolkit for making real world machine learning and data analysis applications in C++. [Boost] [website](http://dlib.net/)
    • PhotonLibOS - A comprehensive C++ framework featuring efficient user-space threading (coroutine with work-stealing), I/O, networking, RPC, HTTP, etc., and used extensively in Alibaba. It is compatible with C++ 14/17/20/23, Linux, MacOS, x86-64, ARM64, gcc and clang. [Apache2] [website](https://photonlibos.github.io/)
    • BDE - The BDE Development Environment from Bloomberg Labs. [Apache2]
    • FunctionalPlus - Functional Programming Library for C++. Write concise and readable C++ code. [MIT]
    • LibSourcey - C++11 evented IO for real-time video streaming and high performance networking applications. [LGPL]
    • ffead-cpp - Framework for Enterprise Application Development. [Apache2]
    • EASTL - Electronic Arts Standard Template Library. [BSD]
    • Seastar - An advanced, open-source C++ framework for high-performance server applications on modern hardware. [Apache-2.0 License] [seastar.io](http://seastar.io/)
    • LibU - A multiplatform utility library written in C. [BSD]
    • xtd - Modern C++20 framework to create console (CLI), forms (GUI) and unit tests (xUnit) applications on Windows, macOS, Linux, iOS, Android, FreeBSD and Haiku. [MIT]
    • OpenFrameworks - A cross platform open source toolkit for creative coding in C++. [MIT] [website](http://www.openframeworks.cc/)
    • Folly - An open-source C++ library developed and used at Facebook. [Apache2]
    • C++ Workflow - C++ Parallel Computing and Asynchronous Networking Engine. [Apache2]
    • Coost - A tiny boost library in C++11. [MIT]
    • CGraph - A cross-platform DAG framework based on C++ without any 3rd-party. [MIT]
    • abseil-cpp - Abseil C++ Common Libraries. [Apache2]
    • tbox - A glib-like multi-platform c library. [Apache2] [website](http://tboox.org/)
    • rpp - Minimal Rust-inspired C++20 STL replacement. [MIT]
    • Siv3D - Siv3D (OpenSiv3D) is a C++20 framework for creative coding (2D/3D games, media art, visualizers, and simulators). [MIT] [website](https://siv3d.github.io/)
    • ETL - Embedded Template Library. [MIT]
    • Yomm2 - Fast, Orthogonal, Open multi-methods. Supersedes [Yomm11](https://github.com/jll63/yomm11) [Boost]
    • AUI - Declarative UI toolkit for C++20. [MPL2]
    • libPhenom - libPhenom is an eventing framework for building high performance and high scalability systems in C. [Apache2]
    • JUCE - An all-encompassing C++ class library for developing cross-platform software. [Core-Module: ISC, Rest: GPL2/GPL3/Proprietary] [website](http://www.juce.com/)
    • ASL - Adobe Source Libraries provides peer-reviewed and portable C++ source libraries. [MIT]
    • STLport - An exemplary version of STL. [Free]
    • itlib - A collection of std-like single-header C++ libraries [MIT]
    • Kigs framework - A free and open source C++ modular multi-purpose cross platform RAD framework. [MIT] [website](https://kigs-framework.org/)
    • libxutils - Simple and yet powerful cross-platform C library providing data structures, algorithms and much more. [MIT]
    • MiLi - Minimal headers-only C++ Library. [Boost]
    • SaneCppLibraries - a set of C++ platform abstraction libraries for macOS, Windows and Linux. [MIT] [website](https://pagghiu.github.io/SaneCppLibraries/)
    • APR - Apache Portable Runtime. Another library of cross-platform utility functions. [Apache2]

  • Debug

    • Bencher - A suite of continuous benchmarking tools designed to catch performance regressions in CI. [MIT]/[Apache2]
    • CMocka - unit testing framework for C with support for mock objects. [Apache2]
    • CUTE - C++ Unit Testing Easier. [LGPL3]
    • CppUnit - C++ port of JUnit. [LGPL2]
    • CTest - The CMake test driver program. [BSD]
    • Deleaker - A tool for resource leak detection, including memory, GDI and handle leaks.
    • Google Mock - A library for writing and using C++ mock classes. [BSD]
    • Mockator - Eclipse CDT plug-in for C++ Seams and Mock Objects.
    • Catch2 - A modern, C++-native, test framework for unit-tests, TDD and BDD. [Boost]
    • backward-cpp - A beautiful stack trace pretty printer for C++. [MIT]
    • CppUTest - Unit testing and mocking framework for C/C++. [BSD-3-clause]
    • FakeIt - Simple mocking framework for C++. [MIT]
    • UnitTest++ - A lightweight unit testing framework for C++. [MIT/X Consortium license]
    • Celero - C++ Benchmarking Framework. [Apache2]
    • Nonius - A C++ micro-benchmarking framework. [CC]
    • fff - A micro-framework for creating fake C functions. [MIT]
    • libtap - Write tests in C. [GPL2]
    • Google Test - Google C++ Testing Framework. [BSD]
    • Boost.Test - Boost Test Library. [Boost] [website](https://boost.org/libs/test)
    • cpp-dump - A C++ library for debugging purposes that can print any variable, even user-defined types. [MIT]
    • benchmark - Google provided small microbenchmark support library. [Apache2]
    • Remotery - Single C File Profiler with Web Viewer. [Apache2]
    • check - Check is a unit testing framework for C. [LGPL-2.1] [website](https://libcheck.github.io/check/)
    • Touca - Open-source regression testing system that you can self-host. [Apache2] [website](https://touca.io/)
    • microprofile - Profiler with web-view for multiple platforms. [Unlicense]
    • dbg-macro - A dbg(…) macro for C++. [MIT]
    • DebugViewPP - Debug logging viewer. [Boost]
    • Unity - Simple Unit Testing for C. [MIT]
    • MinUnit - A minimal unit testing framework for C self-contained in a single header file. [MIT]
    • nanobench - Simple, fast, accurate single-header microbenchmarking functionality for C++11/14/17/20. [MIT] [website](https://nanobench.ankerl.com)
    • utest.h - Single header unit testing framework for C and C++. [Unlicense]
    • libassert - The most over-engineered C++ assertion library. [MIT]
    • Cpptrace - A simple, portable, and self-contained C++ stacktrace library supporting C++11 and greater. [MIT]
    • Hippomocks - Single-header mocking framework. [LGPL-2.1]
    • IceCream-Cpp - Never use cout/printf to debug again [MIT]
    • ig-debugheap - Multiplatform debug heap useful for tracking down memory errors. [BSD]
    • doctest - The lightest feature rich C++ single header testing framework. [MIT]
    • Nanotimer - A simple low-overhead cross-platform timer class for benchmarking. [zLib] [website](http://www.plflib.org/nanotimer.htm)
    • CppBenchmark - Performance benchmark framework for C++ with nanoseconds measure precision. [MIT]
    • CrashCatch - Single-header crash reporting for C++ that logs stack traces and creates `.dmp` and `.txt` crash dumps. [MIT] [website](https://keithpotz.github.io/CrashCatch)
    • utl::profiler - Singe-header profiler for C++17. [MIT]
    • CUTE - C++ Unit Testing Easier. [LGPL3]
    • Deleaker - A tool for resource leak detection, including memory, GDI and handle leaks.
    • Google Mock - A library for writing and using C++ mock classes. [BSD]
    • VLD - Visual Leak Detector. A free, robust, open-source memory leak detection system for Visual C++.

  • Scientific Computing

    • GSL - GNU scientific library. [GPL]
    • FFTW - A C library for computing the DFT in one or more dimensions. [GPL]
    • preCICE - Coupling library for partitioned multi-physics simulations (FSI, CHT, and more). [LGPL] [website](https://precice.org/)
    • AMGCL - a header-only C++ library for solving large sparse linear systems with algebraic multigrid. [MIT]
    • Torch - A scientific computing framework with wide support for machine learning algorithms that puts GPUs first. [BSD-3-Clause] [website](http://torch.ch/)
    • Au - A C++14-compatible physical units library with no dependencies and a single-file delivery option. Emphasis on safety, accessibility, performance, and developer experience. [Apache 2.0] [website](https://aurora-opensource.github.io/au/main/)
    • Trilinos - High performance PDE solvers. [BSD]
    • volesti - High dimensional sampling from truncated distributions, convex optimization and volume computation.

  • Build Systems

    • CMake - Cross-platform free and open-source software for managing the build process of software using a compiler-independent method. [BSD]
    • XMake - A C/C++ cross-platform build utility based on Lua. [Apache]
    • Ccache - A fast C/C++ compiler cache. [GPLv3]
    • build2 - cross-platform build, packaging and dependency management toolchain for developing and packaging C/C++ projects. [MIT]
    • Conan - C/C++ Package Manager, open sourced. [MIT]
    • FASTBuild - High performance, open-source build system supporting highly scalable compilation, caching and network distribution.
    • Ninja - A small build system with a focus on speed.
    • Sconsolidator - Scons build system integration for Eclipse CDT.
    • Spack - A flexible package manager that supports multiple versions, configurations, platforms, and compilers. [Apache-2.0/MIT]
    • SW - Cross-platform C++ (and other langs) Build System and Package Manager with a lot of packages available. [GPLv3]
    • tup - File-based build system that monitors in the background for changed files.
    • Premake - A tool configured with a Lua script to generate project files for Visual Studio, GNU Make, Xcode, Code::Blocks, and more across Windows, Mac OS X, and Linux.
    • Vcpkg - C++ library manager for Windows, Linux, and MacOS. [MIT]
    • Bear - A tool to generate compilation database for clang tooling. [GPLv3]
    • CPM - A C++ Package Manager based on CMake and Git.
    • clib - Package manager for the C programming language. [MIT]
    • Sccache - A fast compiler cache for C/C++, with cross-platform support and cloud backed storage options.
    • Buck - A fast build system that encourages the creation of small, reusable modules over a variety of platforms and languages including C++ developed and used at Facebook. Written in Java. [Apache]
    • waf - Python-based framework for configuring, compiling and installing applications. [BSD] [website](https://waf.io/)
    • Cget - Cmake package retrieval. [Boost] [website](http://cget.readthedocs.io)
    • Sconsolidator - Scons build system integration for Eclipse CDT.
    • Bazel - A multi-language, fast and scalable build system from Google. [Apache]
    • tundra - High-performance code build system designed to give the best possible incremental build times even for very large software projects.
    • MesonBuild - An open source build system meant to be both extremely fast, and, even more importantly, as user friendly as possible.
    • Premake - A tool configured with a Lua script to generate project files for Visual Studio, GNU Make, Xcode, Code::Blocks, and more across Windows, Mac OS X, and Linux.
    • FASTBuild - High performance, open-source build system supporting highly scalable compilation, caching and network distribution.
    • tup - File-based build system that monitors in the background for changed files.
    • Hunter - CMake driven cross-platform package manager for C++. [BSD-2]

  • Compiler

    • GCC - GNU Compiler Collection. Supports C++11/14/1z C11 and OpenMP. [GNU GPL3]
    • PCC - A very old C compiler. Supports C99.
    • Intel C++ Compiler - Developed by Intel.
    • Microsoft Visual C++ - MSVC, developed by Microsoft.
    • Open WatCom - Watcom C, C++, and Fortran cross compilers and tools. [Sybase Open Watcom Public License]
    • Oracle Solaris Studio - C, C++ and Fortran compiler for SPARC and x86. Supports C++11. Available on Linux and Solaris. [OTN Developer License]
    • AMD C++ Compiler - Developed by AMD.
    • c - Compile and execute C "scripts" in one go! [MIT]
    • 8cc - A Small C Compiler.
    • PCC - A very old C compiler. Supports C99.
    • Microsoft Visual C++ - MSVC, developed by Microsoft.
    • TCC - Tiny C Compiler. [LGPL]
    • Clang - A C compiler for LLVM. Supports C++11/14/1z C11. Developed by LLVM Team. [NCSA]
    • Fil-C - a fanatically compatible memory-safe implementation of C and C++.
    • Intel C++ Compiler - Developed by Intel.
    • LLVM - Collection of modular and reusable compiler and toolchain technologies.

  • Compression

    • ZLib - A very compact compression library for data streams. [zlib]
    • bzip2 - A freely available, patent free, high-quality data compressor. [BSD]
    • PhysicsFS - A library to provide abstract access to various archives. It is intended for use in video games, and the design was somewhat inspired by Quake 3's file subsystem. [zlib]
    • LZHAM - Lossless data compression library with a compression ratio similar to LZMA but with much faster decompression. [BSD]
    • LZMA - The default and general compression method of 7z format. [PublicDomain] [website](https://www.7-zip.org)
    • ZZIPlib - Provides read access on ZIP-archives. [MPL/LGPL]
    • LZMAT - An extremely fast real-time lossless data compression library. [GPL]
    • LZ4 - Extremely Fast Compression algorithm. [BSD] [website](http://www.lz4.org/)
    • libarchive - Multi-format archive and compression library. [New BSD] [website](http://www.libarchive.org/)
    • zstd - Zstandard - Fast real-time compression algorithm. Developed by Facebook. [BSD]
    • FiniteStateEntropy - New generation entropy codecs : Finite State Entropy and Huff0.
    • Brotli - Brotli compression format. Developed by Google. [MIT]
    • bzip3 - A better and stronger spiritual successor to BZip2. [LGPL]
    • miniz - Single C source file Deflate/Inflate compression library with zlib-compatible API, ZIP archive reading/writing, PNG writing. [MIT]
    • smaz - Small strings compression library. [BSD]
    • zlib-ng - zlib for the "next generation" systems. Drop-In replacement with some serious optimizations. [zlib]
    • FastLZ - Small & portable byte-aligned LZ77 compression. [MIT]
    • LZFSE - LZFSE compression library and command line tool. Developed by Apple.
    • heatshrink - data compression library for embedded/real-time systems [ISC]
    • minizip-ng - Fork of the popular zip manipulation library found in the zlib distribution. [zlib]
    • Rapidgzip - Gzip Decompression and Random Access for Modern Multi-Core Machines. [Apache-2/MIT]
    • bit7z - A C++ static library offering a clean and simple interface to the 7-zip shared libraries. [MPL2]
    • bzip2 - A freely available, patent free, high-quality data compressor. [BSD]
    • Snappy - A fast compressor/decompressor. [BSD]
    • ZZIPlib - Provides read access on ZIP-archives. [MPL/LGPL]
    • Kanzi - a modern, modular, portable and efficient lossless data compressor implemented in C++. [Apache-2.0]
    • KArchive - A library for creating, reading, writing and manipulating file archives like zip and tar. It also provides transparent compression and decompression of data, using formats like gzip, via a subclass of QIODevice. [LGPL]
    • LZHAM - Lossless data compression library with a compression ratio similar to LZMA but with much faster decompression. [BSD]
    • LZMA - The default and general compression method of 7z format. [PublicDomain] [website](https://www.7-zip.org)

  • Websites

    • C FAQ - C frequently asked questions.
    • Standard C++ - News, Status & Discussion about Standard C++.
    • Build Bench - Compare C++ Builds.
    • Quick Bench - Quick C++ Benchmarks.
    • CppCon - The C++ Conference.
    • C++ by Example - Learn C++ by Example.
    • cplusplus.com - The C++ Resources Network.
    • C++ FAQ - C++ frequently asked questions.
    • C++ FQA Lite - C++ frequently questioned answers.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • Guru of the Week - A regular series of C++ programming problems created and written by Herb Sutter.
    • Meeting C++
    • PVS-Studio’s challenge - PVS-Studio’s C++ quiz in which you're asked to find errors in code fragments of open source projects.
    • Udemy C++ Courses and Tutorials
    • C++ Hints - Every business day hints about most often C++ mistakes and ways to solve them from PVS-Studio Team.
    • C++ tutorial - A user ranked online tutorial bank site displaying multiple courses to learn C++ from.
    • C++ Tutorial for Beginners - A comprenhensive tutorial on C++ curated by trained experts.
    • cppexpert.online - Learn the best C++ practices by improving code snippets with some problems or with bad practices.
    • Udemy C++ Courses and Tutorials
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ for yourself - A comprehensive tutorial on modern C++ covering everything from fundamentals to software design.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • C++ FAQ - C++ frequently asked questions.
    • C++ FQA Lite - C++ frequently questioned answers.
    • Guru of the Week - A regular series of C++ programming problems created and written by Herb Sutter.
    • C++ Hints - Every business day hints about most often C++ mistakes and ways to solve them from PVS-Studio Team.
    • C++ by Example - Learn C++ by Example.
    • C++ reference - A complete online reference for the C and C++ languages and standard libraries.
    • C FAQ - C frequently asked questions.
    • CppCon - The C++ Conference.
    • cppstat - A site that lists C++ features and their support by compilers and standard library implementations in an accessible way.
    • cplusplus.com - The C++ Resources Network.
    • C++ Quiz - A simple online quiz that you can use to test your knowledge of the C++ programming language.
    • Meeting C++
    • C++ Tutorial for Beginners - A comprenhensive tutorial on C++ curated by trained experts.
    • cppexpert.online - Learn the best C++ practices by improving code snippets with some problems or with bad practices.

  • Video

    • FFmpeg - A complete, cross-platform solution to record, convert and stream audio and video. [LGPL2/GPL2]
    • libvpx - VP8/VP9 Codec SDK. [BSD]
    • x265 - Open h.265 video codec implementation. [GPL2] [website](https://x265.readthedocs.io/en/master/)
    • Theora - A free and open video compression format. [BSD]
    • OpenH264 - Open Source H.264 Codec. [BSD] [website](http://www.openh264.org/)
    • avcpp - Modern C++ wrapper around FFmpeg. [MIT]
    • libde265 - Open h.265 video codec implementation. [LGPL] [website](http://www.libde265.org/)
    • libvpx - VP8/VP9 Codec SDK. [BSD]
    • Theora - A free and open video compression format. [BSD]
    • Vireo - A lightweight and versatile video processing library by Twitter. [MIT]

  • Asynchronous Event Loop

    • libevent - An event notification library. [BSD]
    • promise-cpp - Header only library that implements Promise/A+ standard. [Anti-996]
    • C++ Actor Framework - An Open Source Implementation of the Actor Model in C++. [BSD-3-Clause] [website](http://actor-framework.org/)
    • uvw - C++ wrapper for libuv. [MIT]
    • libuv - Cross-platform asynchronous I/O. [BSD]
    • libhv - Cross-platform event loop library. [BSD]
    • Boost.Asio - A cross-platform C++ library for network and low-level I/O programming. [Boost] [website](https://boost.org/libs/asio)
    • Ichor - An event queue which focuses on thread safety and provides dependency injection. [MIT]
    • Asio - A cross-platform C++ library for network and low-level I/O programming that provides developers with a consistent asynchronous model using a modern C++ approach. [Boost] [website](http://think-async.com/)
    • uv-cpp - a simple interface, high-performance network library based on C++11. [MIT]

  • Web Application Framework

    • Kore - ultra fast and flexible web server / framework for web applications developed in C. [ISC]
    • CppCMS - A Free High Performance Web Development Framework (not a CMS). [LGPLv3]
    • Pistache - Pistache is a C++ REST framework written in pure C++11 with no external dependency. [Apache2]
    • Wt - A C++ library for developing web applications. [GPL/Proprietary]
    • Pistache - Pistache is a C++ REST framework written in pure C++11 with no external dependency. [Apache2]
    • TreeFrog Framework - High-speed and full-stack web application framework based on C++ and Qt, which supports HTTP and WebSocket protocol (with O/R mapping). [BSD] [website](http://www.treefrogframework.org/)
    • Cutelyst - A C++ Web Framework built on top of Qt, using the simple approach of Catalyst (Perl) framework. [BSD-3-Clause] [website](https://cutelyst.org/)
    • C++ wfrest - C++ Web Framework REST API. [Apache2]
    • Crow - Crow is a C++ microframework for running web services. It uses routing similar to Python's Flask. [BSD] [website](https://crowcpp.org)
    • facil.io - Evented, high performance C web framework supporting HTTP, WebSockets, SSE and more. [MIT] [website](http://facil.io)
    • Civetweb - Provides easy to use, powerful, C/C++ embeddable web server with optional CGI, SSL and Lua support. [MIT]
    • lwan - Experimental, scalable, high performance HTTP server. [GPL2]
    • userver - Asynchronous C++17 framework with a rich set of abstractions and database drivers for fast and comfortable creation of efficient microservices, services and utilities. [Apache-2.0] [website](https://userver.tech/)
    • oat++ - Light, zero-dependency framework to create high-performance web-services. [Apache-2.0] [website](https://oatpp.io/)
    • QDjango - A web framework written in C++ and built on top of the Qt library. Where possible it tries to follow django's API, hence its name. [LGPL]
    • libOnion - lightweight library to help you create webservers in C programming language. [LGPLv3]
    • Wt - A C++ library for developing web applications. [GPL/Proprietary]
    • Drogon - A C++17/20 based, high-performance HTTP application framework. [MIT]
    • CppCMS - A Free High Performance Web Development Framework (not a CMS). [LGPLv3]
    • Pistache - Pistache is a C++ REST framework written in pure C++11 with no external dependency. [Apache2]

  • Math

    • GMP - A C library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating-point numbers. [LGPL3 & GPL2]
    • ceres-solver - C++ library for modeling and solving large complicated nonlinear least squares problems from google. [BSD]
    • cml - free C++ math library for games and graphics. [Boost]
    • ExprTk - The C++ Mathematical Expression Toolkit Library (ExprTk) is a simple to use, easy to integrate and extremely efficient run-time mathematical expression parser and evaluation engine. [MIT]
    • Geometric Tools - C++ library for computing in the fields of mathematics, graphics, image analysis and physics. [Boost] [website](https://www.geometrictools.com)
    • GMTL - Graphics Math Template Library is a collection of tools implementing Graphics primitives in generalized ways. [GPL2]
    • muparser - muParser is an extensible high performance math expression parser library written in C++. [MIT]
    • lp_solve - A library used to formulate and solve linear programming problems. [LGPL] [website](http://lpsolve.sourceforge.net)
    • PCG-rand - PCG is a family of simple fast space-efficient statistically good algorithms for random number generation. Unlike many general-purpose RNGs, they are also hard to predict. [Apache]
    • Versor - A (fast) Generic C++ library for Geometric Algebras, including Euclidean, Projective, Conformal, Spacetime (etc).
    • Wykobi - A C++ library of efficient, robust and simple to use C++ 2D/3D oriented computational geometry routines. [MIT]
    • CGAL - Collection of efficient and reliable geometric algorithms. [LGPL&GPL] [website](http://www.cgal.org/)
    • DirectXMath - An all inline SIMD C++ linear algebra library for use in games and graphics apps.
    • Vc - SIMD Vector Classes for C++. [BSD]
    • SymEngine - Fast symbolic manipulation library, a rewriting of SymPy's core in C++. [MIT]
    • xtensor - A C++14 library for numerical analysis with multi-dimensional array expressions, inspired by NumPy syntax. [BSD 3-clause] [website](https://xtensor-stack.github.io/xtensor)
    • QuantLib - A free/open-source library for quantitative finance. [Modified BSD] [website](http://quantlib.org/)
    • LibTomMath - A free open source portable number theoretic multiple-precision integer library written entirely in C. [PublicDomain & WTFPL] [website](http://www.libtom.net/)
    • Wagyu - A general library for geometry operations of union, intersections, difference, and xor. [mapbox-wagyu original]
    • NumCpp - A templatized header only C++ implementation of the Python Numpy library. [MIT]
    • GLM - Header-only C++ math library that matches and inter-operates with OpenGL's GLSL math. [MIT] [website](https://glm.g-truc.net/)
    • SimSIMD - Vector distance functions for x86 AVX2, AVX-512, Arm NEON, and SVE. [Apache2]
    • MatX - A GPU-accelerated C++17 numerical computing library with a MATLAB/Python-like syntax. [BSD 3-clause]
    • blaze - high-performance C++ math library for dense and sparse arithmetic. [BSD]
    • linmath.h - A lean linear math library, aimed at graphics programming. [WTFPL]
    • TinyExpr - A C library for parsing and evaluating math expressions from strings. [zlib]
    • MATIO - MATLAB MAT File I/O Library. [BSD-2-Clause] [website](https://sourceforge.net/projects/matio/)
    • autodiff - A modern, fast and expressive C++ library for automatic differentiation. [MIT] [website](https://autodiff.github.io)
    • linalg.h - Single header, public domain, short vector math library for C++. [Unlicense]
    • Klein - A fast, SIMD-optimized C++17 Geometric Algebra library for point, line, and plane projections, intersections, joins, rigid-body motion, and more. [MIT] [website](https://jeremyong.com/klein)
    • StatsLib - A C++ header-only library of statistical distribution functions. [Apache2] [website](https://www.kthohr.com/statslib.html)
    • Armadillo - Fast C++ library for linear algebra & scientific computing. [Apache2] [website](http://arma.sourceforge.net/)
    • Boost.Multiprecision - provides higher-range/precision integer, rational and floating-point types in C++, header-only or with GMP/MPFR/LibTomMath backends. [Boost] [website](https://boost.org/libs/multiprecision)
    • universal - A C++14 header-only library implementing arbitrary posit arithmetic. The posit number system is a tapered floating point that is more efficient than IEEE floating point. Posits enable reproducible computational science. [MIT license]
    • sebsjames/maths - A templated C++20 math library which emphasizes convenience and pleasure for the client programmer (used in [mathplot](https://github.com/sebsjames/mathplot)). [Apache2] [website](https://sebsjames.github.io/maths/)
    • OpenBLAS - An optimized BLAS library based on GotoBLAS2 1.13 BSD version. [BSD 3-clause] [website](http://www.openblas.net/)
    • Apophenia - A C library for statistical and scientific computing. [GPL2]
    • ceres-solver - C++ library for modeling and solving large complicated nonlinear least squares problems from google. [BSD]
    • Versor - A (fast) Generic C++ library for Geometric Algebras, including Euclidean, Projective, Conformal, Spacetime (etc).
    • cml - The configurable math library. [Boost]
    • libfixmath - Cross Platform Fixed Point Maths Library. [MIT]
    • mexce - A single-header, dependency-free JIT compiler for scalar mathematical expressions that generates optimized x87 FPU machine code. [BSD]
    • OMath - Cross-platform modern general purpose math library written in C++23 that suitable for cheat/game development. [ZLIB]
    • utl::random - A C++17 header-only library implementing fast random for Monte-Carlo simulations & gamedev. [MIT]
    • XAD - Powerful Automatic Differentiation for C++. [AGPL] [website](https://auto-differentiation.github.io/)
    • muparser - muParser is an extensible high performance math expression parser library written in C++. [MIT]
    • Wykobi - A C++ library of efficient, robust and simple to use C++ 2D/3D oriented computational geometry routines. [MIT]

  • Coding Style Tools

    • Artistic Style - A tool to format C/C++/C#/Obj-C/Java code. Also known as astyle.
    • ClangFormat - A tool to format C/C++/Obj-C code.
    • Clang-Tidy - Clang-based C++ linter tool.
    • EditorConfig - EditorConfig helps maintain consistent coding styles across different editors and IDEs.
    • Uncrustify - Code beautifier.
    • ClangFormat - A tool to format C/C++/Obj-C code.
    • Artistic Style - A tool to format C/C++/C#/Obj-C/Java code. Also known as astyle.
    • Clang-Tidy - Clang-based C++ linter tool.

  • Miscellaneous

    • libusb - A universal USB library which allows for portable access to USB devices. [LGPL2]
    • American fuzzy lop - fuzz - Crazy fuzzing tool that automatically discovers bugs given time and minimal example input. [Apache2]
    • Cheat Sheets of HackingCPP - Cool cheat sheets and infographics for algorithms, views, containers, randomness, etc.
    • FastFormat - Fast, Safe C++ Formatting inspired by log4j and Pantheios. [Simplified BSD]
    • Remote Call Framework - Inter-process communication framework for C++. [GPL2/Proprietary]
    • Scintilla - A free source code editing component. [MIT]
    • sigslot - C++ Signal/Slot Library. [PublicDomain]
    • StrTk - A C++ library consisting of high performance string processing routines. [MIT]
    • Tulip Indicators - A C library of over 100 financial technical analysis indicators. [LGPL]
    • ZBar - A barcode scanner library, which allows to scan photos/images/video streams for barcodes and return their value. [LGPL2]
    • casacore - A set of c++ core libraries derived from aips++. [LGPL]
    • FastFormat - Fast, Safe C++ Formatting inspired by log4j and Pantheios. [Simplified BSD]
    • Pipes - Pipelines for expressive code on collections in C++. [MIT]
    • stb - A range of single-file libraries for C/C++. [PublicDomain]
    • Concord - A Discord API wrapper library written in C. [MIT] [website](https://cogmasters.github.io/concord)
    • D++ (DPP) - A lightweight, high performance and scalable C++ library for creating Discord Bots. [Apache2] [website](https://dpp.dev)
    • AsmJit - Low-latency machine code generation. [Zlib] [website](https://asmjit.com)
    • Mach7 - A Pattern-matching library for C++. [BSD]
    • date - A date and time library based on the C++11/14/17 <chrono> header. [MIT] [website](https://howardhinnant.github.io/date/date.html)
    • CPPItertools - Range-based for loop add-ons inspired by the Python builtins and itertools library. [BSD-2-Clause]
    • stdman - A tool that parses archived HTML files from [cppreference](https://cppreference.com) and generates groff-formatted manual pages for Unix-based systems. [MIT]
    • cxx-prettyprint - A pretty printing library for C++ containers. [Boost]
    • CCTZ - a C++ library for translating between absolute and civil times using the rules of a time zone. [Apache-2.0]
    • DynaMix - A library which allows you to compose and modify objects at run time. [MIT]
    • MPark.Variant - C++17 `std::variant` for C++11/14/17. [BSL-1.0]
    • {fmt} - Small, safe and fast formatting library for C++. [Simplified BSD] [website](https://fmt.dev)
    • PEGTL - The Parsing Expression Grammar Template Library. [MIT]
    • libcpuid - A small C library for x86 CPU detection and feature extraction. [BSD]
    • libnih - A lightweight library of C functions and structures. [GPL2.1]
    • value-category-cheatsheet
    • jwt-cpp - A header only library for creating and validating JSON web tokens in C++. [MIT]
    • scnlib - scanf for modern C++. [Apache-2.0] [website](https://v1.scnlib.dev/)
    • Klib - Small and lightweight implementations of common algorithms and data structures. [MIT]
    • fast_float - Fast, Exact C++ from_chars, 4x to 10x faster than strtod, part of GCC 12, Chromium, Redis, Webkit/Safari. [Apache2/BSL-1.0/MIT]
    • xxHash - Extremely fast non-cryptographic hash algorithm. [BSD-2-Clause] [website](https://xxhash.com/)
    • SDS - Simple Dynamic Strings library for C. [BSD]
    • StringZilla - the Godzilla of string libraries, splitting, sorting, and shuffling large textual datasets faster than you can say "Tokyo Tower". [Apache-2.0]
    • HighwayHash - Fast strong hash functions: SipHash/HighwayHash. [Apache-2.0]
    • inja - A Template Engine for Modern C++. [MIT]
    • Argon2 - The password hash Argon2, winner of PHC. [CC0/Apache2]
    • faker-cxx - C++20 Faker library for generating fake (but realistic) data for testing and development. [MIT]
    • hedley - A C/C++ header file designed to smooth over some platform-specific annoyances. [website](https://nemequ.github.io/hedley/)
    • fast_io - Significantly faster input/output for C++20. [MIT]
    • reproc - A cross-platform (C99/C++11) process library. [MIT]
    • Kangaru - A dependency injection container for C++11 and C++14. [MIT]
    • palacaze/sigslot - A simple, header only, C++14 signal-slots implementation [MIT]
    • pprint - Pretty Printer for Modern C++. [MIT]
    • SimpleSignal - High performance C++11 signals. [PublicDomain]
    • access_profiler - A tool to count accesses to member variables in c++ programs. [GPL3]
    • QtVerbalExpressions - This Qt lib is based off of the C++ VerbalExpressions library. [MIT]
    • ub-canaries - A collection of C/C++ programs that try to get compilers to exploit undefined behavior.
    • Stage - Mobile robot simulator. [GPL2]
    • CPP-JWT - JSON Web Token library for C++. [MIT]
    • fccf - A command-line tool that recursively searches a directory to find C/C++ source code matching a search string. [MIT]
    • semver.c - A semver parser and render in ANSI C. [MIT]
    • MPH - C++20 [Minimal] Static Perfect Hash library. [MIT]
    • RapidFuzz - Rapid fuzzy string matching in C++ using the Levenshtein Distance. [MIT] [website](https://rapidfuzz.github.io/rapidfuzz-cpp/)
    • libpopcnt - Fast C/C++ bit population count library. [BSD-2-Clause]
    • tgbotxx - Telegram Bot C++ Library. [MIT]
    • SLJIT - Platform independent low-level JIT compiler. [BSD] [website](https://zherczeg.github.io/sljit/)
    • Boost.Signals2 - An implementation of a managed signals and slots system. [Boost] [website](https://boost.org/libs/signals2)
    • happly - A C++ header-only parser for the PLY file format. Parse .ply happily! [MIT]
    • libONVIF - Yet another ONVIF library. [GPL-3.0]
    • simdzone - Fast and standards compliant DNS zone parser. [BSD-3-Clause]
    • SafetyHook - C++23 procedure hooking library. [BSL-1.0]
    • xxhash_cpp - Port of the xxhash library to C++17. [BSD-2-Clause]
    • minja.hpp - A minimalistic C++ Jinja templating engine for LLM chat templates. [MIT]
    • Reaction - A lightweight, header-only reactive programming framework leveraging modern C++20 features for building efficient dataflow applications. [MIT]
    • Tulip Indicators - A C library of over 100 financial technical analysis indicators. [LGPL]
    • rapidhash - Very fast, high quality, platform-independent hashing algorithm. [BSD-2-Clause]
    • libsigc++ - A typesafe callback system for standard C++. [LGPL] [website](https://libsigcplusplus.github.io/libsigcplusplus)
    • casacore - A set of c++ core libraries derived from aips++. [LGPL]
    • gcc-poison - A simple header file for developers to ban unsafe C/C++ functions from applications.
    • libevil - The Evil License Manager. [GPLv3]
    • cpp-lazy - a fast and easy lazy evaluation library for C++11/14/17/20. [MIT]
    • CRCpp - Easy to use and fast C++ CRC library. [BSD-3-Clause]
    • emio - A safe and fast high-level and low-level character input/output library. [MIT]
    • Hexi - Header-only, lightweight C++ library for binary streaming & serialization. [Apache-2.0/MIT]
    • Jinja2С++ - almost full-conformance template engine implementation. [website](https://jinja2cpp.github.io/)
    • KOMIHASH - Very fast, high-quality hash function, discrete-incremental and streamed hashing-capable. [MIT]
    • libenvpp - A modern C++ library for type-safe environment variable parsing. [Apache-2.0]
    • pspsdk - An open-source SDK for PSP homebrew development. [BSD/GNU GPL3]
    • rain - The fastest 128-bit and 256-bit non-crypto hash, passes all tests, and under 140 source lines of code. [Apache-2.0]
    • tiny::optional - Replacement for std::optional that does not waste memory unnecessarily. [BSL-1.0]
    • VarTypes - A feature-rich, object-oriented framework for managing variables in C++ / Qt4. [LGPL]
    • Wildcards - A simple C++ header-only template library implementing matching using wildcards. [BSL-1.0]
    • Remote Call Framework - Inter-process communication framework for C++. [GPL2/Proprietary]
    • Scintilla - A free source code editing component. [MIT]
    • mio - Cross-platform C++11 header-only library for memory mapped file IO. [MIT]
    • Better String - An alternative to the string library for C which is more functional and does not have buffer overflow overrun problems. Also includes a C++ wrapper. [BSD, GPL2]
    • sigslot - C++ Signal/Slot Library. [PublicDomain]
    • ZBar - A barcode scanner library, which allows to scan photos/images/video streams for barcodes and return their value. [LGPL2]
    • ZXing - An open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other languages. [Apache]

  • XML

    • Expat - An XML parser library written in C. [MIT]
    • Libxml2 - The XML C parser and toolkit of Gnome. [MIT]
    • libxml++ - An XML Parser for C++. [LGPL2]
    • PugiXML - A light-weight, simple and fast XML parser for C++ with XPath support. [MIT]
    • RapidXml - An attempt to create the fastest XML parser possible, while retaining useability, portability and reasonable W3C compatibility. [Boost]
    • TinyXML - A simple, small, minimal, C++ XML parser that can be easily integrating into other programs. [zlib]
    • Xerces-C++ - A validating XML parser written in a portable subset of C++. [Apache2]
    • TinyXML2 - A simple, small, efficient, C++ XML parser that can be easily integrating into other programs. [zlib]
    • Xalan C - A library and a command line program to transform XML documents using a stylesheet that conforms to XSLT 1.0 standards. [Apache-2.0] [website](https://xalan.apache.org/)
    • Mini-XML - A small XML parsing library written in ANSI C. [LGPL2 with exceptions]
    • Expat - An XML parser library written in C. [MIT]
    • TinyXML++ - A completely new interface to TinyXML that uses MANY of the C++ strengths. Templates, exceptions, and much better error handling. [MIT]
    • libxml++ - An XML Parser for C++. [LGPL2]
    • PugiXML - A light-weight, simple and fast XML parser for C++ with XPath support. [MIT]
    • RapidXml - An attempt to create the fastest XML parser possible, while retaining useability, portability and reasonable W3C compatibility. [Boost]
    • TinyXML - A simple, small, minimal, C++ XML parser that can be easily integrating into other programs. [zlib]
    • Xerces-C++ - A validating XML parser written in a portable subset of C++. [Apache2]
    • Libxml2 - The XML C parser and toolkit of Gnome. [MIT]

  • Standard Libraries

    • C++ Standard Library - A collection of classes and functions, which are written in the core language and part of the C++ ISO Standard itself.
    • Standard Template Library - The Standard Template Library (STL).
    • C POSIX library - A specification of a C standard library for POSIX systems.
    • ISO C++ Standards Committee - ISO/IEC JTC1/SC22/WG21 - The C++ Standards Committee. [website](http://www.open-std.org/JTC1/SC22/WG21/)
    • The GNU C Library - The purpose of this manual is to tell you how to use the facilities of the GNU C Library.
    • The GNU C Library - The purpose of this manual is to tell you how to use the facilities of the GNU C Library.

  • Artificial Intelligence

    • Evolving Objects - A template-based, ANSI-C++ evolutionary computation library which helps you to write your own stochastic optimization algorithms insanely fast. [LGPL]
    • TensorFlow - An open source software library for numerical computation using data flow graphs. [Apache]
    • PyTorch - Tensors and Dynamic neural networks in Python with strong GPU acceleration. [website](https://pytorch.org)
    • Kaldi - Toolkit for speech recognition. [Apache]
    • tiny-dnn - A header only, dependency-free deep learning framework in C++11. [BSD]
    • flashlight - Flashlight is a fast, flexible machine learning library written entirely in C++. [BSD]
    • Recast/Detour - (3D) Navigation mesh generator and pathfinder, mostly for games. [zlib]
    • frugally-deep - Header-only library for using Keras models in C++. [MIT]
    • Genann - Simple neural network library in C. [zlib]
    • CNTK - Microsoft Cognitive Toolkit (CNTK), an open source deep-learning toolkit. [Boost]
    • ANNetGPGPU - A GPU (CUDA) based Artificial Neural Network library. [LGPL]
    • Veles - Distributed platform for rapid Deep learning application development. [Apache]
    • Txeo - A modern C++ wrapper for TensorFlow. [Apache]
    • oneDNN - An open-source cross-platform performance library for deep learning applications. [Apache] [website](https://01.org/onednn)
    • MXNet - Lightweight, Portable, Flexible Distributed/Mobile Deep Learning with Dynamic, Mutation-aware Dataflow Dep Scheduler; for Python, R, Julia, Scala, Go, JavaScript and more. [website](https://mxnet.apache.org)
    • btsk - Game Behavior Tree Starter Kit. [zlib]

  • Audio

    • FMOD - An easy to use crossplatform audio engine and audio content creation tool for games. [Free for non-commercial/Commercial]
    • KFR - Fast, modern C++ DSP framework, FFT, FIR/IIR filters, Sample Rate Conversion. [GPL/Proprietary]
    • LAME - LAME is a high quality MPEG Audio Layer III (MP3) encoder. [LGPL]
    • Opus - A totally open, royalty-free, highly versatile audio codec. [BSD]
    • PortAudio - PortAudio is a free, cross-platform, open-source, audio I/O library. [MIT]
    • Speex - A free codec for free speech. Obsoleted by Opus. [BSD]
    • Vorbis - Ogg Vorbis is a fully open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format. [BSD]
    • audioFlux - A C library for audio and music analysis, feature extraction. [MIT]
    • Maximilian - C++ Audio and Music DSP Library. [MIT]
    • Tonic - Easy and efficient audio synthesis in C++. [Unlicense]
    • libsoundio - C library for cross-platform real-time audio input and output. [MIT] [website](http://libsound.io/)
    • Aubio - A library for audio and music analysis.[GPL-3.0] [website](https://aubio.org/)
    • rnnoise - Recurrent neural network for audio noise reduction. [BSD-3-Clause]
    • SoLoud - Easy, portable audio engine for games. [zlib]
    • miniaudio - Single file audio playback and capture library. [Unlicense] [website](https://miniaud.io/)
    • dr_libs - Single file audio decoding libraries for C and C++. [Unlicense]
    • AudioFile - A simple C++ library for reading and writing audio files. [MIT]
    • minimp3 - Public domain, header-only MP3 decoder with clean-room implementation. [CC0]
    • ni-media - C++ library for reading and writing audio files. [MIT]
    • Amplitude Audio SDK - A cross-platform audio engine designed with the needs of games in mind. [Apache-2.0] [website](https://amplitudeaudiosdk.com)
    • SELA - SimplE Lossless Audio. [MIT]
    • FMOD - An easy to use crossplatform audio engine and audio content creation tool for games. [Free for non-commercial/Commercial]
    • Verovio - Verovio is a fast and lightweight music notation engraving library. [LGPL] [website](https://www.verovio.org)

  • Biology

    • BioC++ - C++ Computational Libraries for Bioinformatics. [BSD]
    • Chaste - An open source C++ library for the computational simulation of mathematical models developed for physiology and biology. [BSD]
    • SeqAn - Algorithms and data structures for the analysis of sequences with the focus on biological data. [BSD/3-clause]
    • Vcflib - A C++ library for parsing and manipulating VCF files. [MIT]
    • libsequence - A C++ library for representing and analyzing population genetics data. [GPL]
    • Wham - Structural variants (SVs) in Genomes by directly applying association tests to BAM files. [MIT]
    • SeqAn - Algorithms and data structures for the analysis of sequences with the focus on biological data. [BSD/3-clause]

  • CLI

    • Ncurses - A terminal user interface. [MIT]
    • TCLAP - A mature, stable and feature-rich library for defining and accessing command line arguments in ANSI C++. [MIT]
    • cxxopts - Lightweight C++ command line option parser. [MIT]
    • docopt.cpp - A library to generate option parser from docstring. [MIT/Boost]
    • clipp - Easy to use, powerful and expressive command line argument handling for C++11/14/17 contained in a single header file. [MIT]
    • Lyra - A simple to use, composable, command line parser for C++ 11 and beyond. [Boost]
    • oof - Convenient, high-performance RGB color and position control for console output. [MIT]
    • termbox - A C library for writing text-based user interfaces. [MIT]
    • Argh! - A minimalist, frustration-free, header-only argument handler. [BSD]
    • linenoise - A small self-contained alternative to readline and libedit. [BSD-2-Clause]
    • FTXUI - C++ Functional Terminal User Interface. [MIT]
    • tabulate - Table Maker for Modern C++. [MIT]
    • CLI11 - Header only single or multi-file C++11 library for simple and advanced CLI parsing. [BSD]
    • PDCurses - Public domain curses library with both source code and pre-compiled library available. [PublicDomain]
    • TermOx - C++17 Terminal User Interface(TUI) Library. [MIT]
    • FINAL CUT - Library for creating terminal applications with text-based widgets. [LGPL]
    • replxx - A readline and libedit replacement that supports UTF-8, syntax highlighting, hints, works on Unix and Windows. [BSD]
    • argparse - Argument Parser for Modern C++. [MIT]
    • imtui - Immediate Mode Text-based User Interface. [MIT]
    • cli - A cross-platform header only C++14 library for interactive command line interfaces (Cisco style). [Boost]
    • args - A simple header-only C++ argument parser library. [MIT]
    • Ctrl+C - Crossplatform C++11 library to handle Ctrl+C event in custom functions. [MIT]
    • popl - A single-header templated command line arguments and ini file parser for C++ 11 and beyond. [MIT]
    • tuibox - A single-header terminal UI (TUI) library, capable of creating mouse-driven, interactive applications on the command line. [MIT]
    • cpp-terminal - Small header only C++ library for writing multiplatform terminal applications. [MIT]
    • Boost.Program_options - A library to obtain program options via conventional methods such as command line and config file. [Boost] [website](https://boost.org/libs/program_options)
    • gflags - Commandline flags module for C++. [BSD]
    • linenoise-ng - A small, portable GNU readline replacement for Linux, Windows and MacOS which is capable of handling UTF-8 characters. [BSD]
    • TCLAP - A mature, stable and feature-rich library for defining and accessing command line arguments in ANSI C++. [MIT]
    • Argy - Command-Line Argument Parsing Library for Modern C++ — Simple, Intuitive, and Header-only with Zero Dependencies [MIT]
    • barkeep - Small C++ header to display async animations, counters, and progress bars. [Apache-2.0] [website](https://oir.github.io/barkeep/)
    • indicators - Activity indicators for Modern C++. [MIT]
    • Ncurses - A terminal user interface. [MIT]

  • Concurrency

    • OpenCL - The open standard for parallel programming of heterogeneous systems.
    • RaftLib - The RaftLib C++ library, streaming/dataflow concurrency via C++ iostream-like operators. [Apache2]
    • STAPL - A C++ parallel programming framework designed to work on both shared and distributed memory parallel computers. [BSD]
    • Taskflow - A General-purpose Parallel and Heterogeneous Task Programming System. (renamed from Cpp-Taskflow) [MIT]
    • concurrentqueue - A fast multi-producer, multi-consumer lock-free concurrent queue for C++11. [BSD,Boost]
    • ThreadPool - A simple C++11 Thread Pool implementation [zlib]
    • readerwriterqueue - A fast single-producer, single-consumer lock-free queue for C++. [BSD]
    • libcds - A C++ library of Concurrent Data Structures. [BSD]
    • Boost.Compute - A C++ GPU Computing Library for OpenCL. [Boost] [website](https://boost.org/libs/compute)
    • junction - A library of concurrent data structures in C++. [BSD]
    • VexCL - A C++ vector expression template library for OpenCL/CUDA. [MIT]
    • Async++ - A lightweight concurrency framework for C++11, inspired by the Microsoft PPL library and the N3428 C++ standard proposal. [MIT]
    • Bolt - A C++ template library optimized for GPUs. [Apache2]
    • Kokkos - A performance portable programming model for parallel execution and memory abstraction. [BSD]
    • ArrayFire - A general purpose GPU library. [BSD]
    • SObjectizer - An implementation of Actor, Publish-Subscribe, and CSP models in one rather small C++ framework. [BSD-3-Clause]
    • concurrencpp - A general concurrency library containing tasks, executors, timers and C++20 coroutines to rule them all.
    • libfork - A bleeding-edge, lock-free, wait-free, continuation-stealing tasking library built on C++20's coroutines. [MPL-2.0] [website](https://conorwilliams.github.io/libfork/)
    • transwarp - A header-only C++ library for task concurrency. [MIT]
    • FiberTaskingLib - Task-based multi-threading library that supports task graphs with arbitrary dependencies. [Apache]
    • rotor - Event loop friendly C++ actor micro framework. [MIT]
    • marl - Marl is a hybrid thread / fiber task scheduler written in C++ 11. [Apache-2.0]
    • Neco - Concurrency library for C (coroutines). [MIT]
    • ck - Concurrency primitives, safe memory reclamation mechanisms and non-blocking data structures. [BSD]
    • moderngpu - moderngpu is a productivity library for general-purpose computing on GPUs. It is a header-only C++ library written for CUDA. The unique value of the library is in its accelerated primitives for solving irregularly parallel problems. [FreeBSD & Copyright, Sean Baxter]
    • NCCL - Optimized primitives for collective multi-GPU communication. [BSD]
    • stdgpu - Efficient STL-like Data Structures on the GPU. [Apache2]
    • cuda-api-wrappers - Lightweight, Modern-C++ wrappers for the CUDA GPU programming runtime API. [BSD]
    • Libclsph - An OpenCL based GPU accelerated SPH fluid simulation library. [MIT]
    • BS::thread_pool - A fast, lightweight, and easy-to-use C++17 thread pool library [MIT]
    • Intel Games Task Scheduler - A task scheduling framework designed for the needs of game developers. [MIT]
    • Channel - Thread-safe container for sharing data between threads. [MIT]
    • Quantum - A powerful C++ coroutine dispatcher framework built on top of [Boost.Coroutine2](https://boost.org/libs/coroutine2).
    • Intel TBB - Intel® Threading Building Blocks. [Apache2]
    • C++React - A reactive programming library for C++11. [Boost]
    • alpaka - Abstraction library for parallel kernel acceleration. [LGPLv3+]
    • CUB - CUB provides state-of-the-art, reusable software components for every layer of the CUDA programming mode. [New BSD]
    • cupla - C++ API to run CUDA/C++ on OpenMP, Threads, TBB, ... through Alpaka. [LGPLv3+]
    • Coros - An easy-to-use and fast library for task-based parallelism, utilizing coroutines. [BSL-1.0]
    • STAPL - A C++ parallel programming framework designed to work on both shared and distributed memory parallel computers. [BSD]
    • HPX - A general purpose C++ runtime system for parallel and distributed applications of any scale. [Boost]
    • Intel Parallel STL - Intel® implementation of C++17 STL for C++11 and above. [Apache2]
    • libdill - Introduces structured concurrency in C. [MIT]
    • libdispatch - Grand Central Dispatch (GCD), developed by Apple Inc., is a task parallelism technology based on the thread pool pattern. libdispatch is a library that provides the implementation of GCD's services. [Apache-2.0] [website](https://apple.github.io/swift-corelibs-libdispatch/)
    • libmill - Introduces Go-style concurrency in C. [MIT]
    • OpenMP - The OpenMP API.
    • RaftLib - The RaftLib C++ library, streaming/dataflow concurrency via C++ iostream-like operators. [Apache2]

  • Database

    • DuckDB - in-process SQL OLAP Database Management System. [MIT]
    • MySQL++ - A C++ wrapper for MySQL's C API. [LGPL]
    • ODB - An open-source, cross-platform, and cross-database object-relational mapping (ORM) system for C++. [GPLv2]
    • SQLite - A completely embedded, full-featured relational database in a few 100k that you can include right into your project. [PublicDomain]
    • upscaledb - An embedded "typed" key/value store with a built-in query interface. [GPLv3]
    • Hiredis - A minimalistic C client library for the Redis database. [BSD]
    • sqlpp11 - A type safe embedded domain specific language for SQL queries and results in C++. [BSD-2-Clause]
    • SOCI - A database abstraction layer for C++. [Boost]
    • MongoDB C++ Driver - C++ driver for MongoDB. [Apache2]
    • hiberlite - C++ Object-relational mapping for sqlite3. [BSD]
    • sqlite_modern_cpp - Header only C++14 wrapper around sqlite library. [MIT]
    • sqlite_orm - SQLite ORM light header only library for modern C++. [AGPL + paid MIT]
    • SimDB - High performance, shared memory, lock free, cross platform, single file, minimal dependencies, C++11 key-value store. [Apache2]
    • redis3m - Wrapper of hiredis with clean C++ interface, supporting sentinel and ready to use patterns. [Apache2]
    • MongoDB Libbson - A BSON utility library. [Apache2]
    • SQLiteC++ - SQLiteC++ (SQLiteCpp) is a smart and easy to use C++ SQLite3 wrapper. [MIT]
    • RocksDB - Embedded key-value store for fast storage from facebook. [BSD]
    • LevelDB - A fast key-value storage library written at Google that provides an ordered mapping from string keys to string values. [BSD]
    • libpg_query - C library for accessing the PostgreSQL parser outside of the server environment. [BSD-3-Clause]
    • Velox - A C++ vectorized database acceleration library aimed to optimizing query engines and data processing systems. [Apache-2.0] [website](https://velox-lib.io/)
    • MongoDB C Driver - MongoDB client library for C. [Apache2]
    • Infinity - The AI-native database built for LLM applications, providing incredibly fast vector and full-text search. [Apache2]
    • TileDB - Fast Dense and Sparse Multidimensional Array DBMS. [MIT] [website](https://tiledb.io/)
    • libpqxx - The official C++ client API for PostgreSQL. [BSD-3-Clause]
    • nanodbc - A small C++ wrapper for the native C ODBC API. [MIT]
    • UnQLite - A self-contained, serverless, zero-configuration, transactional NoSQL engine. [BSD-2-Clause] [website](https://unqlite.symisc.net/)
    • Trilogy - a client library for MySQL-compatible database servers, designed for performance, flexibility, and ease of embedding. [MIT]
    • UStore - Multi-Modal database for BLOBs, JSON, and graphs. [Apache2]
    • Kuzu - Embeddable property graph database management system built for query speed and scalability. Implements Cypher. [MIT] [website](https://kuzudb.com/)
    • ClickHouse - C++ client for ClickHouse DBMS. [Apache2]
    • TigerBeetleDB C++ client (Community) - TigerBeetle is a financial accounting database designed for mission critical safety and performance to power the future of financial services. [BSL-1.0]
    • TinyORM - Modern C++ ORM library. [MIT] [website](https://www.tinyorm.org/)
    • mgclient - C/C++ Memgraph Client. [Apache2]
    • TidesDB - High-performance, durable, transactional embedded storage engine designed for flash and RAM optimization. [MPL-2.0] [website](https://tidesdb.com/)
    • CrossDB - Ultra High-performance Lightweight Embedded and Server OLTP RDBMS. [MPL-2.0] [website](https://crossdb.org/)
    • Reindexer - Embeddable, in-memory, document-oriented database with a high-level Query builder interface. [Apache2] [website](https://reindexer.io/)
    • Speedb - Community-led project: A RocksDB compliant high performance scalable embedded key-value store. [Apache2]
    • sqlgen - A reflection-based ORM and SQL query generator for C++-20, similar to Python's SQLAlchemy/SQLModel or Rust's Diesel. [MIT]
    • LMDB++ - C++11 wrapper for the LMDB embedded database library. [PublicDomain]

  • Font

    • FreeType - FreeType is a freely available software library to render fonts. [FTL & GPLv2]
    • harfbuzz - A text shaping engine. [Old MIT]
    • libschrift - A lightweight TrueType font rendering library. [ISC]
    • otfcc - A C library and utility used for parsing and writing OpenType font files. [Apache-2.0]
    • Fontconfig - Font configuration and customization library. [MIT] [website](https://www.freedesktop.org/wiki/Software/fontconfig/)

  • Game Engine

    • delta3d - A robust simulation platform. [LGPL2]
    • Oxygine - A cross-platform 2D C++ game engine. [MIT]
    • Urho3D - A free lightweight, cross-platform 2D and 3D game engine implemented in C++. Greatly inspired by OGRE and Horde3D. [MIT]
    • raylib - A simple and easy-to-use library to enjoy videogames programming. [zlib/libpng] [website](http://www.raylib.com/)
    • Godot - A fully featured, open source, MIT licensed, game engine. [MIT]
    • GamePlay - A cross-platform native C++ game framework for creating 2D/3D mobile and desktop games. [Apache2]
    • Panda3D - A game engine, a framework for 3D rendering and game development for Python and C++ programs. [Modified BSD] [website](https://www.panda3d.org/)
    • Spring - A powerful free cross-platform RTS game engine. [GPLv2/GPLv3] [website](https://springrts.com/)
    • Corange - A game engine written in pure C, SDL and OpenGL. [BSD]
    • OpenXRay - a community-modified X-Ray engine used in S.T.A.L.K.E.R. game series. [Modified BSD/non-commercial only]
    • Halley - A lightweight game engine written in C++14 with a "true" entity-component system. [Apache 2.0]
    • Polycode - A cross-platform framework for creative code in C++ (with Lua bindings). [MIT] [website](http://polycode.org/)
    • KlayGE - a cross-platform open source game engine with plugin-based architecture. [GPLv2] [website](http://www.klayge.org/)
    • o3de - An open-source, real-time, multi-platform 3D engine based on Amazon Lumberyard. [Apache2] [website](https://o3de.org/)
    • Torque3D - An open-source C++ engine built for 3D game development. [MIT] [website](https://torque3d.org/torque3d)
    • Torque2D - An open-source and cross-platform C++ engine built for 2D game development. [MIT] [website](https://torque3d.org/torque2d)
    • EnTT - Gaming meets modern C++. [MIT]
    • ezEngine - Is a free, open-source game engine written in C++. Its philosophy is to be modular and flexible, such that it can be adapted to many different use cases. [MIT] [website](https://ezengine.net/)
    • nCine - A cross-platform 2D game engine with an emphasis on performance, written in C++11 and optionally scriptable in Lua. [MIT] [website](https://ncine.github.io/)
    • PixelGameEngine - The official distribution of olcPixelGameEngine, a tool used in javidx9's YouTube videos and projects. [OLC3]
    • toy engine - toy is a thin and modular c++ game engine and offers simple expressive c++ idioms to design full featured 2D or 3D games in fast iterations.
    • Hazel Game Engine - Hazel is primarily an early-stage interactive application and rendering engine for Windows. [Apache-2.0 license]
    • Axmol Engine - A cross-platform game engine for desktop, mobile, and XBOX (UWP), derived from Cocos2d-x-4.0. [MIT] [website](https://axmol.dev/)
    • crown - Crown is a general purpose data-driven game engine, written from scratch in orthodox C++ with a minimalistic and data-oriented design philosophy in mind. [MIT]
    • Cocos2d-x - A multi-platform framework for building 2d games, interactive books, demos and other graphical applications. [MIT]
    • Grit - Community project to build a free game engine for implementing open world 3D games. [MIT]
    • IX-Ray Platform - Fork of X-Ray 1.6 engine that aims to improve gaming experience and simplify development of modifications. [Modified MIT/non-commercial only]
    • quakeforge - Actively maintained branch of the original Quake engine code with 20+ years of development. [GPL-2.0]
    • delta3d - A robust simulation platform. [LGPL2]
    • Oxygine - A cross-platform 2D C++ game engine. [MIT]

  • GUI

    • CEGUI - Flexible, cross-platform GUI library.
    • FLTK - Fast, light, cross-platform C++ GUI toolkit. [LGPL2]
    • FOX Toolkit - an open-source, cross-platform widget toolkit. [LGPL]
    • iup - Multi-platform toolkit for building graphical user interfaces. [MIT]
    • nana - Nana is a cross-platform library for GUI programming in modern C++ style. [Boost]
    • QCustomPlot - Qt plotting widget without further dependencies. [GPLv3]
    • QwtPlot3D - A feature-rich Qt/OpenGL-based C++ programming library, providing essentially a bunch of 3D-widgets. [zlib]
    • wxWidgets - A C++ library that lets developers create applications for Windows, Mac OS X, Linux and other platforms with a single code base. [Own LGPL]
    • Saucer - A modern, cross-platform C++ webview library. [MIT]
    • FOX Toolkit - an open-source, cross-platform widget toolkit. [LGPL]
    • libui - Simple and portable (but not inflexible) GUI library in C that uses the native GUI technologies of each platform it supports. [MIT]
    • Slint - Lightweight GUI toolkit for desktop and embedded. [GPL/Free/Proprietary] [website](https://slint.dev/)
    • GacUI - GPU Accelerated C++ User Interface, with WYSIWYG developing tools, XML supports, built-in data binding and MVVM features. [Ms-PL]
    • nana - Nana is a cross-platform library for GUI programming in modern C++ style. [Boost]
    • nuklear - A single-header ANSI C gui library. [PublicDomain]
    • imgui - Immediate Mode Graphical User Interface with minimal dependencies. [MIT]
    • implot - Immediate Mode Plotting widgets for imgui. [MIT]
    • TGUI - Cross-platform modern c++ GUI. [Zlib] [website](https://tgui.eu/)
    • Yue - A library for creating native cross-platform GUI apps. [LGPLv2]
    • Elements - Lightweight, fine-grained, resolution independent, modular GUI library. [MIT]
    • MyGUI - Fast, flexible and simple GUI. [MIT]
    • NAppGUI - SDK for building cross-platform desktop apps in ANSI-C. [MIT] [website](https://nappgui.com/en/home/web/home.html)
    • RmlUi - The HTML/CSS User Interface library evolved. Fork of libRocket. [MIT]
    • WebUI - Use any web browser as GUI, with your preferred language in the backend and HTML5 in the frontend. [MIT] [website](https://webui.me/)
    • Boden - Native, mobile, cross-platform GUI Framework. [GPL/LGPL/Proprietary] [website](https://www.boden.io)
    • NanoGui - A minimalistic cross-platform widget library for OpenGL 3.x or higher. [BSD]
    • CEGUI - Flexible, cross-platform GUI library.
    • wxCharts - A library to create charts in wxWidgets applications. [MIT] [website](https://www.wxishiko.com/wxCharts/)
    • gtkmm - The official C++ interface for the popular GUI library GTK+. [LGPL]
    • iup - Multi-platform toolkit for building graphical user interfaces. [MIT]
    • Qwt - Qt Widgets for Technical Applications. [Own based on LGPL]
    • QwtPlot3D - A feature-rich Qt/OpenGL-based C++ programming library, providing essentially a bunch of 3D-widgets. [zlib]
    • Sciter - Sciter is an embeddable HTML/CSS/scripting engine aimed to be used as an UI layer of modern desktop applications. [Free/Commercial]

  • Graphics

    • Irrlicht - A high performance realtime 3D engine written in C++. [zlib]
    • Ogre 3D - A scene-oriented, real-time, flexible 3D rendering engine (as opposed to a game engine) written in C++. [MIT] [website](https://www.ogre3d.org)
    • OpenVDB - Library and tools for storing, editing, and rendering volumetric datasets. [MPL2]
    • Skia - A complete 2D graphic library for drawing Text, Geometries, and Images. [BSD] [website](https://skia.org/)
    • Harfang 3D
    • bgfx - A cross-platform rendering library. [BSD]
    • magnum - Lightweight and modular C++11/C++14 graphics middleware for games and data visualization. [MIT] [website](http://magnum.graphics)
    • libigl - Simple C++ geometry processing library. [MPL2]
    • DirectXTK - A collection of helper classes for writing DirectX 11.x code in C++. [MIT]
    • Yocto/GL - Tiny C++ Libraries for Data-Driven Physically-based Graphics. [MIT]
    • Partio - Library for wrangling particle data, with support for most common file formats. [Modified BSD]
    • urho3d - Cross-platform rendering and game engine. [Many different, mostly MIT]
    • NanoVG - Antialiased 2D vector drawing library on top of OpenGL for UI and visualizations. [Zlib]
    • LunaSVG - a standalone SVG rendering library in C++. [MIT]
    • LLGL - Low Level Graphics Library (LLGL) is a thin abstraction layer for the modern graphics APIs. [BSD-3-Clause]
    • Diligent Engine - A modern cross-platform low-level 3D graphics library. [Apache2]
    • herebedragons - A basic 3D scene implemented with various engines, frameworks or APIs. [MIT] [website](http://simonrodriguez.fr/dragon/)
    • GLFW - A simple, cross-platform OpenGL wrangling library. [zlib/libpng]
    • Blend2D - 2D vector graphics engine powered by a JIT compiler. [Zlib] [website](https://blend2d.com/)
    • TinySpline - A small, yet powerful ANSI C library for interpolating, transforming, and querying arbitrary NURBS, B-Splines, and Bézier curves. [MIT]
    • olive.c - Simple 2D Graphics Library. [MIT]
    • assimp - Open Asset Import Library (assimp) is a cross-platform 3D model import library which aims to provide a common API for different 3D asset file formats. [BSD-3-Clause] [website](http://www.assimp.org)
    • Horde3D - A small 3D rendering and animation engine. [EPL]
    • OpenSubdiv - Pixar's library for evaluating and rendering subdivision surfaces on CPU and GPU. [Modified Apache2]
    • Ion - A small and efficient set of libraries for building cross-platform client or server applications that use 3D graphics. [Apache2] [website](https://google.github.io/ion/)
    • ThorVG - a platform-independent portable library that allows for drawing vector-based scenes and animations, including SVG and Lottie. [MIT] [website](https://www.thorvg.org/)
    • C-Turtle - A C++11 header-only turtle graphics library acting as a CImg wrapper. [MIT]
    • GLFWPP - A thin modern C++17 header-only wrapper for GLFW. [MIT]
    • micro-gl - Realtime, Embeddable, Headers Only C++11 CPU vector graphics. no STD lib, no FPU and no GPU required. [CUSTOM] [website](https://micro-gl.github.io/docs/microgl)
    • Irrlicht - A high performance realtime 3D engine written in C++. [zlib]
    • Panda3D - A framework for 3D rendering and game development for Python and C++. [BSD]

  • Image Processing

    • CImg - A small, open source, C++ toolkit for image processing. [Own LGPL or GPL]
    • CxImage - An image processing and conversion library to load, save, display, transform BMP, JPEG, GIF, PNG, TIFF, MNG, ICO, PCX, TGA, WMF, WBMP, JBG, J2K images. [zlib]
    • FreeImage - An open source library that supports popular graphics image formats and others as needed by today's multimedia applications. [GPL2 or GPL3]
    • DCMTK - DICOM Toolkit.
    • ITK - An open-source, cross-platform system for image analysis. [Apache2 from ITK 4.0]
    • Magick++ - ImageMagick program interfaces for C++. [Apache2]
    • MagickWnd - ImageMagick program interfaces for C. [Apache2]
    • OpenCV - Open source computer vision. [Apache2] [website](https://opencv.org)
    • OpenEXR - Cross-platform library for high dynamic range imaging. [Modified BSDF]
    • stb-image - STB single-header image loading library. [Public Domain]
    • tesseract-ocr - An OCR engine. [Apache2]
    • MozJPEG - Improved JPEG encoder. [BSD/BSD-3-Clause/ZLIB]
    • libfacedetection - Open source library for face detection in images. The face detection speed can reach 1500FPS. [BSD]
    • LodePNG - PNG encoder and decoder in C and C++. [Zlib]
    • Video++ - A C++14 high performance video and image processing library. [MIT]
    • Simd - C++ image processing library with using of SIMD: SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AVX, AVX2, AVX-512, VMX(Altivec) and VSX(Power7), NEON for ARM. [MIT]
    • VIGRA - A generic C++ computer vision library for image analysis. [MIT X11]
    • libvips - A fast image processing library with low memory needs. [LGPL] [website](http://www.vips.ecs.soton.ac.uk/)
    • GD - GD Graphics Library, famously used in PHP for image loading/manipulation & thumbnail generation. [custom permissive license, requires mention in user docs] [website](http://libgd.github.io/)
    • libjpeg-turbo - A JPEG image codec that uses SIMD instructions to accelerate baseline JPEG encoding and decoding. [IJG & BSD-3-Clause & zlib] [website](https://libjpeg-turbo.org/)
    • libpng - the reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. [libpng-2.0] [website](https://libpng.sourceforge.io/)
    • libjxl - JPEG XL image format reference implementation. [BSD-3-Clause]
    • OpenJPEG - an open-source JPEG 2000 codec written in C language. [BSD-2-Clause]
    • QOI - The “Quite OK Image Format” for fast, lossless image compression. [MIT]
    • libspng - Simple, modern libpng alternative. [BSD-2] [website](https://libspng.org/)
    • TinyDNG - Header-only Tiny DNG/TIFF loader and writer in C++. [MIT]
    • libavif - Library for encoding and decoding .avif files. [BSD-2-Clause]
    • Boost.GIL - Generic Image Library. [Boost] [website](https://boost.org/libs/gil)
    • fpng - Super fast C++ .PNG writer/reader. [Unlicense]
    • BitmapPlusPLus - Simple and Fast header only Bitmap C++ library. [MIT]
    • PlutoFilter - A single-header, zero-allocation image filter library in C. [MIT]
    • OpenImageIO - Powerful image and texture wrangling library with support for a wide number of common lossy and RAW formats. [Modified BSD]
    • TinyEXIF - Tiny ISO-compliant C++ EXIF and XMP parsing library for JPEG. [MIT]
    • Leptonica - Leptonica is an open source library containing software that is broadly useful for image processing and image analysis applications. [BSD-2-Clause] [website](http://leptonica.org/index.html)
    • TinyTIFF - lightweight TIFF reader/writer library. [GPL-3.0]
    • DCMTK - DICOM Toolkit.
    • OpenEXR - Cross-platform library for high dynamic range imaging. [Modified BSDF]

  • Internationalization

    • gettext - GNU 'gettext'. [GPL2]
    • libiconv - An encoding conversion library between different character encodings. [GPL]
    • utf8.h - Single header utf8 string functions for C and C++. [Unlicense]
    • simdutf - Unicode routines (UTF8, UTF16, UTF32): billions of characters per second using SSE2, AVX2, NEON, AVX-512. [Apache-2/MIT]
    • utf8proc - A clean C library for processing UTF-8 Unicode data. [MIT]
    • uni-algo - Unicode Algorithms Implementation for C/C++. [Unlicense or MIT]
    • gettext - GNU 'gettext'. [GPL2]
    • IBM ICU - A set of C/C++ and Java libraries providing Unicode and Globalization support. [ICU]

  • Inter-process communication

    • Apache Thrift - Efficient cross-language IPC/RPC, works between C++, Java, Python, PHP, C#, and many more other languages. Originally developed by Facebook. [Apache2]
    • WAMP - Provides RPC and pub/sub messaging patterns. (various implementations, various languages)
    • xmlrpc-c - A lightweight RPC library based on XML and HTTP. [BSD]
    • simple-rpc-cpp - A simple RPC wrapper generator to C/C++ functions. [BSD]
    • WAMP - Provides RPC and pub/sub messaging patterns. (various implementations, various languages)
    • gRPC - A high performance, open source, general-purpose RPC framework. [BSD] [website](http://www.grpc.io/)
    • nanomsg - A simple high-performance implementation of several "scalability protocols". [MIT] [website](http://nanomsg.org/)
    • Ice - Comprehensive RPC framework with support for C++, C#, Java, JavaScript, Python and more. [GPLv2]
    • libjson-rpc-cpp - JSON-RPC framework for C++ servers and clients. [MIT]
    • rpclib - A modern C++ msgpack-RPC server and client library. [MIT]
    • Cap'n Proto - Fast data interchange format and capability-based RPC system. [MIT] [website](https://capnproto.org/)
    • nng - nanomsg-next-generation, a light-weight brokerless messaging library. [MIT] [website](https://nanomsg.github.io/nng/)
    • bRPC - bRPC is an Industrial-grade RPC framework using C++ Language, which is often used in high performance system such as Search, Storage, Machine learning, Advertisement, Recommendation etc. [Apache2] [website](https://brpc.apache.org/)
    • SRPC - A lightweight RPC system that supports multiple protocols and OpenTelemetry. [Apache2]
    • iceoryx - True zero-copy inter-process communication framework for safety critical systems with bindings for C, Rust. Runs on Linux, QNX, Windows, Mac OS, FreeBSD. [Apache2] [website](https://iceoryx.io/)
    • Boost.Interprocess - Header-only Boost library that supports kernel-level shared memory and memory-mapped files, with in-built synchronization mechanisms (semaphores, mutexes, and more). [Boost] [website](https://boost.org/libs/interprocess)
    • WAMP - Provides RPC and pub/sub messaging patterns. (various implementations, various languages)
    • eCAL - Pub/sub, client/server, C++/Python/C#, various message protocols (protobuf, capnproto ..). [Apache2] [website](http://www.ecal.io/)

  • JSON

    • libjson - Lightweight JSON library. [?]
    • Jansson - C library for encoding, decoding and manipulating JSON data. [MIT]
    • YAJL - A fast streaming JSON parsing library in C. [ISC]
    • frozen - JSON parser and generator for C/C++. [GPL & GPL2]
    • JsonCpp - A C++ library for interacting with JSON. [MIT]
    • json11 - A tiny JSON library for C++11. [MIT]
    • PicoJSON - A header-file-only, JSON parser serializer in C++. [BSD]
    • sajson - Lightweight, extremely high-performance JSON parser for C++11. [MIT]
    • JSON++ - A JSON parser in C++. [MIT]
    • json-voorhees - JSON library for C++. Support for C++11. No dependencies, fast and dev-friendly. [Apache2]
    • jsoncons - A C++ header-only library for JSON and JSON-like binary formats with JSONPointer, JSONPatch, JSONPath and JMESPath. [Boost]
    • JeayeSON - A very sane (header only) C++ JSON library. [BSD]
    • LIBUCL - Universal configuration library parser. [BSD-2-Clause]
    • libjson - A JSON parser and printer library in C. easy to integrate with any model. [LGPL]
    • json - JSON for Modern C++. [MIT] [website](https://json.nlohmann.me)
    • DAW JSON Link - Fast, convenient JSON serialization and parsing in C++. [BSL-1.0]
    • json.h - A simple one header/one source solution to parsing JSON in C and C++. [Unlicense]
    • yyjson - A high performance JSON library written in ANSI C. [MIT]
    • json-struct - High performance, single header JSON parser parsing to and from C++ structs. [MIT]
    • cJSON - Ultralightweight JSON parser in ANSI C. [MIT]
    • UltraJSON - Ultra fast JSON decoder and encoder written in C. [BSD-3-Clause]
    • parson - Parson is a lighweight json library written in C. [MIT]
    • json-c - A JSON implementation in C. [MIT]
    • Jsmn - A minimalistic JSON parser in C. [MIT]
    • json-build - C89 tiny zero-allocation JSON serializer. [MIT]
    • taoJSON - Zero-dependency C++ header-only JSON library. [MIT]
    • QJson - A qt-based library that maps JSON data to QVariant objects. [LGPL2]
    • json.cpp - a baroque JSON parsing / serialization library for C++. [Apache-2.0]
    • Boost.PropertyTree - A property tree parser/generator that can be used to parse XML/JSON/INI/Info files. [Boost] [website](https://boost.org/libs/property_tree)
    • Sonic-Cpp - A fast JSON serializing & deserializing library, accelerated by SIMD. [Apache-2.0]
    • meojson - Next-gen C++ JSON/JSON5 Serialization Engine | Zero Dependency | Header-Only | Unleash JSON Potential. [MIT]
    • RapidJSON - A fast JSON parser/generator for C++ with both SAX/DOM style API. [MIT] [website](https://rapidjson.org)
    • simdjson - Extremely fast JSON library that can parse gigabytes of JSON per second. [Apache-2.0]
    • jbson - jbson is a library for building & iterating BSON data, and JSON documents in C++14. [Boost]
    • jute - Very simple C++ JSON Parser. [PublicDomain]
    • ujson - µjson is a a small, C++11, UTF-8, JSON library. [MIT]
    • Jsonifier - A few classes for parsing and serializing objects from/into JSON - very rapidly. [MIT]
    • jsonParse - A simple JSON parser in ANSI C. [MIT]
    • json-parser - Very low footprint JSON parser written in portable ANSI C. [BSD]
    • libjson - Lightweight JSON library. [?]

  • Logging

    • Log4cpp - A library of C++ classes for flexible logging to files, syslog, IDSA and other destinations. [LGPL]
    • templog - A very small and lightweight C++ library which you can use to add logging to your C++ applications. [Boost]
    • P7Baical - An open source and cross-platform library for high-speed sending telemetry & trace data with minimal usage of CPU and memory. [LGPL]
    • spdlog - Super fast, header only, C++ logging library.
    • glog - C++ implementation of the Google logging module.
    • log4cplus - A simple to use C++ logging API providing thread-safe, flexible, and arbitrarily granular control over log management and configuration. [BSD & Apache2]
    • plog - Portable and simple log for C++ in less than 1000 lines of code. [MPL2]
    • loguru - A lightweight C++ logging library. [PublicDomain]
    • G3log - Asynchronous logger with Dynamic Sinks. [PublicDomain]
    • reckless - Low-latency, high-throughput, asynchronous logging library for C++. [MIT]
    • lwlog - Very fast synchronous and asynchronous C++17 logging library. [MIT]
    • Quill - Asynchronous cross platform low latency logging library. [MIT]
    • haclog - An extremely fast plain C logging library. [MIT]
    • Boost.Log - Designed to be very modular and extensible. [Boost] [website](https://boost.org/libs/log)
    • Blackhole - Attribute-based logging framework, which is designed to be fast, modular and highly customizable. [MIT]
    • templog - A very small and lightweight C++ library which you can use to add logging to your C++ applications. [Boost]
    • BqLog - A lightweight, high-performance logging system used in projects such as "Honor of Kings". [Apache-2.0]
    • fmtlog - A performant fmtlib-style logging library with latency in nanoseconds. [MIT]
    • ng-log - C++14 library for application-level logging. [BSD-3-Clause]
    • Abseil Logging - The Abseil Logging library provides facilities for writing log messages to stderr, files, or other sinks. [Apache-2.0]
    • Easylogging++ - Extremely light-weight high performance logging library for C++11 (or higher) applications. [MIT]
    • Log4cpp - A library of C++ classes for flexible logging to files, syslog, IDSA and other destinations. [LGPL]

  • Machine Learning

    • sofia-ml - The suite of fast incremental algorithms for machine learning. [Apache2]
    • darknet - Open source neural network framework written in C and CUDA. [PublicDomain] [website](https://pjreddie.com/darknet/)
    • Recommender - C library for product recommendations/suggestions using collaborative filtering (CF). [BSD]
    • CCV - C-based/Cached/Core Computer Vision Library, A Modern Computer Vision Library. [BSD]
    • catboost - A fast, scalable, high performance Gradient Boosting on Decision Trees library. [Apache2]
    • Caffe - A fast framework for neural networks. [BSD]
    • ncnn - A high-performance neural network inference computing framework optimized for mobile platforms. [BSD]
    • m2cgen - A CLI tool to transpile trained classic ML models into a native C code with zero dependencies. [MIT]
    • FAISS - A library for efficient similarity search and clustering of dense vectors. [MIT]
    • ONNX runtime - C and C++ library for training and inference ONNX models. ONNX is a standard that AI models can be converted into, regardless of the library they are trained with. [MIT] [website](https://onnxruntime.ai/)
    • mlpack - A scalable c++ machine learning library. [LGPLv3] [website](http://www.mlpack.org/)
    • Minerva - A fast and flexible system for deep learning. [Apache2]
    • MeTA - A modern C++ data sciences toolkit. [MIT] [website](https://meta-toolkit.org/)
    • Fido - A highly-modular C++ machine learning library for embedded electronics and robotics. [MIT] [website](http://fidoproject.github.io/)
    • SHOGUN - The Shogun Machine Learning Toolbox. [GPLv3]
    • xgboost - Scalable, Portable and Distributed Gradient Boosting (GBDT, GBRT or GBM) Library, for Python, R, Java, Scala, C++ and more. Runs on single machine, Hadoop, Spark, Flink and DataFlow. [Apache2]
    • VLFeat - The VLFeat open source library implements popular computer vision algorithms specialising in image understanding and local featurexs extraction and matching. [BSD-2-Clause] [website](http://www.vlfeat.org/)
    • USearch - Fast search and clustering library for vectors and strings. [Apache2]
    • libsvm - A simple, easy-to-use, efficient library for Support Vector Machines. [BSD-3-Clause] [website](https://www.csie.ntu.edu.tw/~cjlin/libsvm/)
    • ggml - Tensor library for machine learning with 16-bit and 4-bit quantization support. [MIT]
    • RNNLIB - RNNLIB is a recurrent neural network library for sequence learning problems. [GPLv3]
    • OpenCV - Open Source Computer Vision Library. [BSD] [website](http://opencv.org/)
    • sofia-ml - The suite of fast incremental algorithms for machine learning. [Apache2]

  • Multimedia

    • LIVE555 Streaming Media - Multimedia streaming library using open standard protocols (RTP/RTCP, RTSP, SIP). [LGPL]
    • libVLC - libVLC (VLC SDK) media framework. [GPL]
    • SFML - Simple and Fast Multimedia Library. [zlib] [website](http://www.sfml-dev.org/)
    • QtAv - A multimedia playback framework based on Qt and FFmpeg to write a player easily. [LGPL] [website](http://wang-bin.github.io/QtAV/)
    • libav - A collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata. [LGPL v2.1+ and others] [website](https://www.libav.org/)
    • libass - Portable subtitle renderer for the ASS/SSA subtitle format. [ISC]
    • TagLib - A library for reading and editing the metadata of several popular audio formats. [LGPL/MPL] [website](https://taglib.org/)
    • SDL - Simple DirectMedia Layer. [zlib] [website](https://libsdl.org)
    • MediaInfoLib - Convenient unified display of the most relevant technical and tag data for video and audio files. [BSD]
    • LIVE555 Streaming Media - Multimedia streaming library using open standard protocols (RTP/RTCP, RTSP, SIP). [LGPL]
    • GStreamer - A library for constructing graphs of media-handling components. [LGPL]

  • Networking

    • ACE - An OO Network Programming Toolkit in C++. [?MIT?]
    • cpp-netlib - A collection of open-source libraries for high level network programming. [Boost]
    • KCP - A fast and reliable ARQ protocol that helps applications to reduce network latency. [MIT]
    • Libmicrohttpd - GNU libmicrohttpd is a small C library that is supposed to make it easy to run an HTTP server as part of another application. [LGPL v2.1+]
    • lwIP - A lightweight TCP/IP stack. [Modified BSD]
    • POCO - C++ class libraries and frameworks for building network- and internet-based applications that run on desktop, server, mobile and embedded systems. [Boost] [website](http://pocoproject.org/)
    • lwIP - A lightweight TCP/IP stack. [Modified BSD]
    • TQUIC - A high-performance, lightweight, and cross-platform QUIC library, exposed to C and C++. [Apache2]
    • Muduo - A C++ non-blocking network library for multi-threaded server in Linux. [BSD]
    • uWebSockets - µWS is one of the most lightweight, efficient & scalable WebSocket & HTTP server implementations available. [Zlib]
    • C++ REST SDK - C++ REST SDK (previously named Casablanca). [Apache2]
    • nghttp2 - HTTP/2 C Library. [MIT] [website](https://nghttp2.org/)
    • WebSocket++ - C++/Boost Asio based websocket client/server library. [BSD]
    • Boost.Beast - HTTP and WebSocket built on Boost.Asio in C++11. [Boost] [website](https://www.boost.org/libs/beast)
    • evpp - C++ high performance networking with TCP/UDP/HTTP protocols. [BSD]
    • c-ares - A C library for asynchronous DNS requests. [MIT]
    • restclient-cpp - Simple REST client for C++. It wraps libcurl for HTTP requests. [MIT]
    • Mongoose - Extremely lightweight webserver. [GPL2]
    • curlpp - C++ wrapper around libcURL. [MIT]
    • Tufão - An asynchronous web framework for C++ built on top of Qt. [LGPL2]
    • PcapPlusPlus - a multiplatform C++ network sniffing and packet parsing and crafting framework. [Unlicense]
    • curlcpp - An object oriented C++ wrapper for CURL(libcurl). [MIT]
    • Seasocks - Simple, small, C++ embeddable webserver with WebSockets support. [BSD]
    • libhttpserver - C++ library for creating an embedded Rest HTTP server (and more). [LGPL2.1]
    • Wangle - A client/server application framework to build asynchronous, event-driven modern C++ services. [Apache-2.0]
    • libwebsockets - A lightweight pure C WebSocket implementation that provides both client and server libraries. [LGPL2.1 + static link exception] [website](https://libwebsockets.org/)
    • libquic - A QUIC protocol library extracted from Chromium's QUIC Implementation. [BSD]
    • libpcap - A portable C/C++ library for network traffic capture. [BSD] [website](https://www.tcpdump.org/)
    • Onion - HTTP server library in C designed to be lightweight and easy to use. [Apache2/GPL2]
    • cpp-httplib - A single file C++11 header-only HTTP/HTTPS server library. [MIT]
    • ZeroMQ - High-speed, modular asynchronous communication library. [LGPL3/MPL2] [website](http://zeromq.org/)
    • PicoHTTPParser - A tiny, primitive, fast HTTP request/response parser. [MIT]
    • HTTP Parser - A http request/response parser for C. [MIT]
    • ada - WHATWG-compliant and fast URL parser written in modern C++. [Apache-2.0/MIT]
    • H2O - An optimized HTTP server with support for HTTP/1.x and HTTP/2. It can also be used as a library. [MIT]
    • Lithium - Build high performance C++ HTTP servers without being a C++ expert. [MIT]
    • Proxygen - Facebook's collection of C++ HTTP libraries including an easy to use HTTP server. [BSD]
    • RedPanda - Streaming data platform for developers. Kafka API compatible. 10x faster. [BSL]
    • UCall - A high-performance SIMD-accelerated RPC library on io_uring. [Apache2]
    • wdt - An embeddedable library (and command line tool) aiming to transfer data between 2 systems as fast as possible over multiple TCP paths. [BSD-3-Clause]
    • mTCP - Highly scalable user-level TCP stack for multicore systems. [Modified BSD]
    • PF_RING™ - High-speed packet processing framework. [LGPL-2.1] [website](https://www.ntop.org/products/packet-capture/pf_ring/)
    • DPDK - Data Plane Development Kit, libraries and drivers for fast packet processing. [BSD-3-Clause & GPL-2.0] [website](https://www.dpdk.org/)
    • Dyad.c - Asynchronous networking for C. [MIT]
    • CppServer - Ultra fast and low latency asynchronous socket server & client C++ library with support TCP, SSL, UDP, HTTP, HTTPS, WebSocket protocols and 10K connections problem solution. [MIT]
    • nghttp3 - HTTP/3 library written in C. [MIT] [website](https://nghttp2.org/nghttp3/)
    • Restinio - A header-only C++14 library that gives you an embedded HTTP/Websocket server. [BSD]
    • MQTT-C - A portable MQTT C client for embedded systems and PCs alike. [MIT] [website](https://liambindle.ca/MQTT-C)
    • ENet - Reliable UDP networking library. [MIT] [website](http://enet.bespin.org/)
    • tlse - Single C file TLS 1.2/1.3 implementation, using tomcrypt as crypto library [BSD-2-Clause]
    • Restbed - C++11 Asynchronous RESTful framework. [AGPL]
    • uriparser - Strictly RFC 3986 compliant URI parsing and handling library. [BSD-3-Clause]
    • cpp-netlib/uri - URI parser/builder library for C++, compatible with RFC 3986 and RFC 3987. [Boost]
    • librdkafka - Apache Kafka client library for C and C++. [BSD-2-Clause]
    • cpr - A modern C++ HTTP requests library with a simple but powerful interface. Modeled after the Python Requests module. [MIT] [website](https://docs.libcpr.org)
    • WAFer - A C language-based ultra-light software platform for scalable server-side and networking applications. Think node.js for C programmers. [GPL2]
    • ACE - An OO Network Programming Toolkit in C++. [?MIT?]
    • Breep - Event based, high-level C++14 peer-to-peer library. [EUPL-1.1 (OSI approved)]
    • FTP client for C++ - C++ client for making FTP requests. [MIT]
    • mailio - mailio is a cross platform C++ library for MIME format and SMTP, POP3 and IMAP protocols. [BSD]
    • cpp-netlib - A collection of open-source libraries for high level network programming. [Boost]
    • libcurl - Multiprotocol file transfer library. [MIT/X derivate license]
    • RakNet - A cross platform, open source, C++ networking engine for game programmers. [BSD]

  • Office Open XML

    • FreeXL - an open source library to extract valid data from within Spreadsheets. [MPL/GPL-2/LGPL-2]
    • SimpleXlsxWriter - XLSX files writer for Microsoft Excel 2007 and above. [zlib]
    • libxlsxwriter - A C library for creating Excel XLSX files. [BSD-2-Clause] [website](https://libxlsxwriter.github.io/)
    • libxls - Read binary Excel files from C/C++ [BSD-2-Clause]
    • OpenXLSX - A C++ library for reading, writing, creating and modifying Microsoft Excel® (.xlsx) files. [BSD-3-Clause]
    • DuckX - C++ library for creating and modifying Microsoft Word (.docx) files. [MIT]
    • XLSX I/O - C library for reading and writing .xlsx files. [MIT]

  • PDF

    • litePDF - Library to create and edit PDF documents that uses GDI functions through a device context to draw the page content. [LGPL v3 and zlib]
    • MuPDF - A lightweight PDF, XPS, and E-book viewer. [AGPL/Proprietary]
    • PDFium - PDF generation and rendering library. [BSD-3-Clause]
    • Poppler - Open-source multi-backend PDF rendering library based on the xpdf-3.0 code base. [GPLv2/GPLv3]
    • Xpdf - Xpdf is a free PDF viewer and toolkit, including a text extractor, image converter, HTML converter, and more. [GPL v2/GPL v3]
    • DynaPDF - An easy-to-use PDF generation library. [Commercial]
    • libharu - A free, cross platform, open-sourced software library for generating PDF. [zlib]
    • QPDF - A tool and C++ library for content-preserving transformations of PDF files. [Apache-2.0] [website](https://qpdf.sourceforge.io/)
    • PDF-Writer - High performance library for creating, modiyfing and parsing PDF files in C++ [Apache-2.0] [website](https://www.pdfhummus.com/)
    • pdfio - A simple C library for reading and writing PDF files. [Apache-2] [website](https://www.msweet.org/pdfio/)
    • DynaPDF - An easy-to-use PDF generation library. [Commercial]
    • litePDF - Library to create and edit PDF documents that uses GDI functions through a device context to draw the page content. [LGPL v3 and zlib]
    • PDFium - PDF generation and rendering library. [BSD-3-Clause]
    • PoDoFo - A library to work with the PDF file format. [LGPL]

  • Robotics

    • MOOS-IvP - A set of open source C++ modules for providing autonomy on robotic platforms, in particular autonomous marine vehicles.
    • MRPT - Mobile Robot Programming Toolkit. [BSD]
    • Robotics Library (RL) - A self-contained C++ library for robot kinematics, motion planning and control. [BSD]
    • PCL - Point Cloud Library is a standalone, large scale, open project for 2D/3D image and point cloud processing. [BSD] [website](http://www.pointclouds.org/)
    • Ruckig - Real-time motion generation for robots and machines. [MIT] [website](https://ruckig.com)
    • YARP (Yet Another Robot Platform) - Library and toolkit for communication and device interfaces. [BSD-3-Clause] [website](http://www.yarp.it/)
    • SPICE Toolkit - Library and toolkit for computing geometric information used in planning and analyzing science observations obtained from robotic spacecraft. [MIT] [website](https://naif.jpl.nasa.gov/naif/toolkit.html)
    • MOOS-IvP - A set of open source C++ modules for providing autonomy on robotic platforms, in particular autonomous marine vehicles.
    • MRPT - Mobile Robot Programming Toolkit. [BSD]
    • Robotics Library (RL) - A self-contained C++ library for robot kinematics, motion planning and control. [BSD]
    • RobWork - A collection of C++ libraries for simulation and control of robot systems. [Apache2] [website](http://www.robwork.dk/)
    • ROS - Robot Operating System provides libraries and tools to help software developers create robot applications. [BSD]

  • Scripting

    • AngelScript - AngelScript is a game-oriented interpreted/compiled scripting language. [zlib]
    • djinni - A tool for generating cross-language type declarations and interface bindings. [Apache2]
    • Lua - A minimal and fast scripting engine for configuration files and basic application scripting. [MIT]
    • QuickJS - a small and embeddable Javascript engine. [MIT]
    • V8 - A fast JavaScript engine by Google that can be embedded into any C++ application. [BSD]
    • MiniScript - scripting language modern, elegant, easy to learn, and easy to embed in your own C# or C++ projects. [MIT]
    • SIP - C or C++ Bindings Generator for Python v2 and v3. [GPL]
    • libffi - A portable foreign-function interface library. [MIT] [website](https://sourceware.org/libffi/)
    • pybind11 - Seamless operability between C++11 and Python. [BSD]
    • SWIG - A wrapper/interface Generator that let you link your c++ code to JavaScript, Perl, PHP, Python, Tcl and Ruby. [GPL/Output not licensed] [website](http://www.swig.org/)
    • nbind - Magical headers that make your C++ library accessible from JavaScript. [MIT]
    • PHP-CPP - A library to build PHP extensions with C++. [Apache2] [website](http://www.php-cpp.com/)
    • sol2 - A C++ <-> Lua API wrapper with advanced features and top notch performance. [MIT]
    • LuaBridge - A lightweight, dependency-free library for binding Lua to C++. [MIT]
    • v8pp - Header-only library to expose C++ classes and functions into V8 to use them in JavaScript code. [BOOST] [website](https://pmed.github.io/v8pp/)
    • luacxx - C++11 API for creating Lua bindings. [MIT]
    • Luau - A fast, small, safe, gradually typed embeddable scripting language derived from Lua. [MIT] [website](https://luau.org/)
    • CppSharp - Tools and libraries to glue C/C++ APIs to high-level languages. [MIT]
    • ctypes.sh - A foreign function interface for bash. [MIT]
    • JerryScript - Ultra-lightweight JavaScript engine for the Internet of Things. [Apache-2.0] [website](https://jerryscript.net/)
    • Duktape - An embeddable JavaScript engine with compact footprint. [MIT] [website](http://duktape.org)
    • Cython - Cython is an optimising static compiler for both the Python programming language and the extended Cython programming language (based on Pyrex). It makes writing C extensions for Python as easy as Python itself. [Apache] [website](http://cython.org/)
    • txiki.js - A tiny JavaScript runtime. [MIT]
    • nanobind - tiny and efficient C++/Python bindings. [BSD-3-Clause]
    • cppimport - Import C++ files directly from Python! [MIT]
    • Boost.Python - A C++ library which enables seamless interoperability between C++ and the Python programming language. [Boost] [website](https://boost.org/libs/python)
    • JavaCpp - The missing bridge between Java and native C++. [Apache2]
    • V7 - An embedded JavaScript engine. [GPL2]
    • ChakraCore - A JavaScript engine by Microsoft that can be embedded into nodejs. [MIT]
    • LuaBridge3 - A lightweight, dependency-free library for binding Lua, LuaJIT, Luau and Ravi to C++. [MIT]
    • pocketpy - C++17 header-only Python interpreter for game scripting. [MIT] [website](https://pocketpy.dev/)
    • ChaiScript - An easy to use embedded scripting language for C++. [BSD] [website](http://chaiscript.com/)
    • djinni - A tool for generating cross-language type declarations and interface bindings. [Apache2]
    • V8 - A fast JavaScript engine by Google that can be embedded into any C++ application. [BSD]

  • Online Compiler

    • codechef - A simple online compiler CodeChef.
    • codepad - An online compiler/interpreter, and a simple collaboration tool.
    • coliru - Online compiler/shell with support for various C++ compilers.
    • Compiler Explorer - An interactive compiler with assembly output available.
    • Ideone - An online compiler and debugging tool which allows you to compile source code and execute it online in more than 60 programming languages.
    • Programiz - An online compiler for learners and developers.
    • repl.it - A powerful yet simple tools and platforms for educators, learners, and developers.
    • Rextester - Online compiler which provides several compilers(Clang, GCC, MSVC) and several editors.
    • Try It Online - TIO is a family of online interpreters for an evergrowing list of practical and recreational programming languages.
    • Wandbox - An online Clang/GCC compiler with Boost available.
    • paiza.io - An online C/C++ compiler with multiple files supporting feature, Github(gist) integration and collaborative editing.
    • InterviewBit - A simple and easy to use online C++ compiler.
    • OneCompiler - An online compiler supporting over 70 programming languages and database systems.
    • Wandbox - An online Clang/GCC compiler with Boost available.
    • coliru - Online compiler/shell with support for various C++ compilers.
    • CompileOnline - Compile and Execute C++ online on Linux.
    • Programiz - An online compiler for learners and developers.
    • InterviewBit - A simple and easy to use online C++ compiler.
    • Rextester - Online compiler which provides several compilers(Clang, GCC, MSVC) and several editors.
    • Ideone - An online compiler and debugging tool which allows you to compile source code and execute it online in more than 60 programming languages.
    • repl.it - A powerful yet simple tools and platforms for educators, learners, and developers.
    • Compiler Explorer - An interactive compiler with assembly output available.

  • Debugger

    • Comparison of debuggers - A list of Debuggers from Wikipedia.
    • GDB - GNU Debugger.
    • Metashell - An interactive template metaprogramming shell which includes the MDB metadebugger.
    • x64dbg - An open-source x64/x32 debugger for windows.
    • Metashell - An interactive template metaprogramming shell which includes the MDB metadebugger.
    • LLDB - The LLDB Debugger.
    • Valgrind - A tool for memory debugging, memory leak detection, and profiling.

  • API Design

  • Books

  • Coding Standards

  • Coding Style

  • Podcasts

    • CppCast - The first podcast by C++ developers for C++ developers.
    • CppChat - A (sometimes) weekly look at what's going on in the world of C++ chatting with a guest from the community.
    • CppCast - The first podcast by C++ developers for C++ developers.
    • CppChat - A (sometimes) weekly look at what's going on in the world of C++ chatting with a guest from the community.

  • Talks

  • Videos

  • Weblogs

  • Regular Expression

    • SRELL - Unicode-aware regular expression template library for C++. [BSD]
    • RE2 - A software library for regular expressions via a finite-state machine using automata theory. [BSD-3-Clause]
    • CppVerbalExpressions - C++ regular expressions made easy. [MIT]
    • CTRE - A Compile time PCRE (almost) compatible regular expression matcher. [MIT]
    • Hyperscan - Hyperscan is a high-performance multiple regex matching library by Intel. Provides simultaneous matching of large numbers of regexps (up to tens of thousands). Typically used in a DPI library stack. [BSD]
    • Oniguruma - A modern and flexible regular expressions library that supports a variety of character encodings. [BSD]
    • TRE - The approximate regex matching library and agrep command line tool. [BSD-2-Clause]
    • sregex - A non-backtracking NFA/DFA-based Perl-compatible regex engine library for matching on large data streams. [BSD]
    • Vectorscan - A portable fork of the high-performance regular expression matching library. [BSD-3-Clause] [website](https://www.vectorcamp.gr/project/vectorscan/)
    • PIRE - Perl Incompatible Regular Expressions library by Yandex. Can be really fast (more than 400 MB/s). [LPGL v3.0]
    • SLRE - Super Light Regexp engine for C/C++. [GPLv2/Proprietary]
    • PCRE - A regular expression C library inspired by the regular expression capabilities in Perl. [BSD]

  • Articles

  • Virtual Machines

    • MicroPython - Aims to put an implementation of Python 3.x on a microcontroller. [MIT]
    • TinyVM - A small, fast, lightweight virtual machine written in pure ANSI C. [MIT]
    • CarpVM - "interesting" VM in C. Let's see how this goes. [GPLv3]

  • Serialization

    • protobuf - Protocol Buffers - Google's data interchange format. [BSD]
    • cereal - A C++11 library for serialization. [BSD]
    • MessagePack - Efficient binary serialization format "like JSON" for C and C++. [Apache2] [website](http://msgpack.org/)
    • protobuf-c - Protocol Buffers implementation in C. [BSD]
    • FlatBuffers - A Memory efficient serialization library. [Apache2]
    • zpp_bits - Actually, the fastest modern **S**erialization library. Just check [this video](https://www.youtube.com/watch?v=G7-GQhCw8eE&ab_channel=CppCon).
    • Bond - An open source, cross-platform framework for working with schematized data. [MIT]
    • nanopb - Small code-size Protocol Buffers implementation in ANSI C. [Zlib]
    • cista - A C++17 library for zero-copy high-performance (de-)serialization. [MIT]
    • FastBinaryEncoding - Fast Binary Encoding is ultra fast and universal serialization solution for C++, C#, Go, Java, JavaScript, Kotlin, Python, Ruby, Swift. [MIT]
    • upb - A small protobuf implementation in C. [BSD]
    • Bitsery - Header only C++ binary serialization library. [MIT]
    • iguana - a modern, universal and easy-to-use serialization engine developed in C++20 and C++17. [Apache2]
    • cppcodec - Header-only C++11 library to encode/decode base64, base32 and hex with consistent, flexible API. [MIT]
    • Boost.Serialization - Boost Serialization Library. [Boost] [website](https://boost.org/libs/serialization)
    • Protocol Puffers - A little, highly templated, and protobuf-compatible serialization/deserialization header-only library written in C++20. [Apache-2.0]
    • BitSerializer - Multi-format serialization library (JSON, XML, YAML, CSV, MsgPack) [MIT]
    • SimpleBinaryEncoding - encoding and decoding application messages in binary format for low-latency applications. [Apache2]
    • YAS - Very fast **Y**et **A**nother **S**erialization library supports the binary/text/json formats. [Boost]
    • Kaitai Struct - A declarative language to describe various binary data structures and a compiler to generate C++ parser code. [GPLv3+][MIT][Apache2]
    • Wirehair - O(N) Fountain Code for Large Data. [BSD-3-Clause]
    • mrpt-serialization - Versioned serialization to binary or text formats. [BSD] [website](https://docs.mrpt.org/reference/latest/group_mrpt_serialization_grp.html)

  • Yaml

    • LibYAML - A C library for parsing and emitting YAML. [MIT] [website](https://pyyaml.org/wiki/LibYAML)
    • yaml-cpp - A YAML parser and emitter in C++. [MIT]
    • rapidyaml - Rapid YAML is a C++ library to parse and emit YAML. [MIT]
    • LibCYAML - C library for reading and writing YAML. [ISC]
    • fkYAML - A C++ header-only YAML library. [MIT]
    • libfyaml - A fancy 1.2 YAML and JSON parser/writer. [MIT]
    • mini-yaml - Single header YAML 1.0 C++11 serializer/deserializer. [MIT]

  • Documentation

    • doxygen - The de facto standard tool for generating documentation from annotated C++ sources. [GPL2] [website](https://www.doxygen.org)
    • Sphinx - Sphinx makes it easy to create intelligent and beautiful documentation. [BSD-2-Clause] [website](https://www.sphinx-doc.org)
    • hdoc - The modern documentation tool for C++. [AGPL/Proprietary] [website](https://hdoc.io)
    • Natural Docs - Natural Docs is an open source documentation generator for multiple programming languages. [AGPL/Proprietary] [website](https://www.naturaldocs.org)
    • Doxide - Modern documentation for modern C++, configure with YAML, output Markdown. [Apache 2.0] [website](https://doxide.org)
    • doxyrest - A compiler from Doxygen XML to reStructuredText for Sphinx. [MIT]

  • Physics

    • Kratos - framework for building parallel, multi-disciplinary simulation software, aiming at modularity, extensibility, and high performance. [BSD] [website](http://www.cimne.com/kratos/)
    • Simbody - High-performance C++ multibody dynamics/physics library for simulating articulated biomechanical and mechanical systems like vehicles, robots, and the human skeleton. [Apache2]
    • Project Chrono - An open source multi-physics simulation engine. [BSD-3-Clause] [website](https://projectchrono.org/)
    • Chipmunk - A fast and lightweight 2D game physics library. [MIT] [website](https://chipmunk-physics.net/)
    • Bullet - A 3D physics engine for games. [zlib] [website](http://bulletphysics.org)
    • Jolt Physics - A multi core friendly rigid body physics and collision detection library. [MIT]
    • LiquidFun - A 2D physics engine for games. [BSD-like]
    • Newton Dynamics - An integrated solution for real time simulation of physics environments. [zlib]
    • PhysX - An open-source realtime physics engine middleware SDK developed by Nvidia as a part of Nvidia GameWorks software suite. [BSD-3-Clause]
    • Box2D - A 2D physics engine for games. [BSD-like]
    • PlayRho - An interactive physics engine & library. [Zlib]
    • SOFA - SOFA is an open-source framework targeting at real-time simulation, with an emphasis on medical simulation. [LGPL] [website](https://www.sofa-framework.org)
    • ofxBox2d - openFrameworks wrapper for Box2D. [BSD-like]
    • QuarkPhysics - A 2D Soft Body and Rigid Body Physics Engine. [MIT]
    • Quantum++ - A modern C++11 quantum computing library. [MIT]

  • BitTorrent

    • libtorrent - rasterbar) - An efficient feature complete C++ bittorrent implementation. [BSD]
    • LibTorrent - rakshasa) - BitTorrent library. [GPL]
    • libutp - uTorrent Transport Protocol library. [MIT]
    • jech/dht - BitTorrent DHT library in C. [MIT]

  • DSP

    • DSPFilters - A collection of useful C++ classes for digital signal processing. [MIT]
    • iir1 - IIR Realtime C++ filter library. [MIT]
    • kissfft - A Fast Fourier Transform (FFT) library that tries to Keep it Simple, Stupid. [BSD-3-Clause]
    • wavelib - C implementation of 1D and 2D wavelet transforms. [BSD-3-Clause]
    • pocketfft - FFT implementation based on FFTPack, but with several improvements. [BSD-3-Clause]

  • Containers

    • sparsepp - A fast, memory efficient hash map for C++. [BSD 3-clause]
    • hat-trie - C++ implementation of a fast and memory efficient HAT-trie. [MIT]
    • Hashmaps - Implementation of open addressing hash table algorithms in C++. [MIT]
    • C++ B-tree - A template library that implements ordered in-memory containers based on a B-tree data structure. [Apache2]
    • robin-map - Fast hash map and hash set using robin hood hashing. [MIT]
    • fixed-containers - Header-only C++20 library that provides fixed capacity constexpr containers. [MIT]
    • parallel-hashmap - A family of header-only, very fast and memory-friendly hashmap and btree containers [Apache2] [website](https://greg7mdp.github.io/parallel-hashmap/)
    • flat_hash_map - A very fast flat hashtable with Fibonacci hashing.
    • frozen - a header-only, constexpr alternative to gperf for C++14 users. [Apache-2.0]
    • plf::colony - An unordered "bag"-type container which outperforms std containers in high-modification scenarios while maintaining permanent pointers to non-erased elements regardless of insertion/erasure. [zLib] [website](http://www.plflib.org/colony.htm)
    • Hopscotch map - A fast header-only hash map which uses hopscotch hashing for collisions resolution. [MIT]
    • plf::list - A std::list implementation which removes range splicing in order to enable cache-friendlier structure, yielding significant performance gains. [zLib] [website](http://www.plflib.org/list.htm)
    • robin-hood-hashing - Fast & memory efficient hashtable based on robin hood hashing for C++14. [MIT]
    • plf::stack - A replacement container for the std::stack container adaptor, with better performance than any std container in a stack context. [zLib] [website](http://www.plflib.org/stack.htm)
    • unordered_dense - A fast & densely stored hashmap and hashset based on robin-hood backward shift deletion. [MIT]
    • svector - Compact SVO optimized vector for C++17 or higher. [MIT]
    • dynamic_bitset - Simple Useful Libraries: C++17/20 header-only dynamic bitset. [MIT] [website](https://pinam45.github.io/dynamic_bitset/)
    • tree.hh - An STL-like C++ header-only tree library. [GPL2+]
    • st_tree - A fast and flexible c++ template class for tree data structures. [Apache-2.0]
    • sqlitemap - Persistent map backed by SQLite. [MIT]
    • LSHBOX - A c++ toolbox of locality-sensitive hashing (LSH), provides several popular LSH algorithms, also support Python and MATLAB. [GPL]
    • librb - C implementation of ring (circular) buffer, with full thread awareness that allows for concurrent read/write and can automatically grow in size when needed. [BSD] [website](https://librb.bofc.pl/)
    • PGM-index - A data structure that enables fast lookup, predecessor, range searches and updates in arrays of billions of items using orders of magnitude less space than traditional indexes. [Apache2] [website](https://pgm.di.unipi.it)

  • Serial Port

    • Serial Communication Library - Cross-platform, Serial Port library written in C++. [MIT] [website](http://wjwwood.io/serial/)
    • CSerialPort - lightweight cross-platform serial port library. [LGPL3]
    • Libserial - Serial Port Programming in C++. [BSD-3-Clause]

  • Reflection

    • Better Enums - Reflective enums (to string, iteration). Single header. [BSD] [website](http://aantron.github.io/better-enums/)
    • RTTR - A C++11 library for reflection. [MIT] [website](http://www.rttr.org)
    • CPP-Reflection - C++ Reflection using clang. [MIT]
    • Ponder - A C++11 library for reflection. [MIT]
    • Nameof - Header-only C++17 library provides nameof macros and functions to obtain the simple name of variable, type, function, macro, and enum. [MIT]
    • Magic Enum - Header-only C++17 library provides static reflection for enums (to string, from string, iteration), work with any enum type without any macro or boilerplate code. [MIT]
    • reflect-cpp - Serialization through reflection, including automatic field name retrieval from structs. [MIT]
    • REFLECT - C++20 Static Reflection library. [MIT]
    • meta - Header-only, non-intrusive and macro-free runtime reflection system in C++. [MIT]
    • CPFG - A C++03 library for reflection, callback and script binding. [Apache2]
    • magic_get - std::tuple like methods for user defined types without any macro or boilerplate code. [Boost]
    • visit_struct - A miniature library for struct-field reflection in C++. [Boost]
    • Easy Reflection - Easy and fast reflection + serialization solution like in Rust, Java or Go. [Apache]
    • simple_enum - An Fast, Intuitive and Type-Safe C++ Enumeration Support Library. [BSL-1.0] [website](https://arturbac.github.io/simple_enum/)
    • config-loader - A C++17 static reflection framework, from parse configuration file to native data structure. [MIT]
    • clReflect - C++ Reflection using clang. [MIT]
    • TSMP - An intrusion and macro-free C++20 library for static reflection. It uses libclang to extract reflection data from your source code and makes it usable via template specialization. [MIT]
    • Refureku - A C++17 runtime reflection and code generation library. [MIT]

  • CSV

    • Fast C++ CSV Parser - Small, easy-to-use and fast header-only library for reading CSV files. [BSD-3-Clause]
    • Glaze - High performance, header only, CSV library with reflection support. [MIT]
    • lazycsv - A fast, lightweight and single-header csv parser for modern C++. [MIT]
    • Vince's CSV Parser - A fast, self-contained, streaming C++17 CSV parser with optional type-casting and statistics. [MIT]
    • rapidcsv - An easy-to-use, header-only C++ CSV parser library. [BSD-3-Clause]
    • commata - Just another header-only C++17 CSV parser. [Unlicense]
    • Csv::Parser - Compile-time and runtime CSV parser written in C++17. [Zlib]
    • ssp - A header only "csv" parser which is fast and versatile with modern C++ api. [MIT]
    • csv2 - Fast CSV parser for modern C++. [MIT]
    • zsv - The world's fastest (simd) CSV parser, with an extensible CLI. [MIT]

  • Memory Allocation

    • memory - STL compatible C++ memory allocator library. [ZLib]
    • mimalloc - A compact general purpose allocator with excellent performance. [MIT]
    • Boehm GC - Conservative garbage collector for C and C++. [similar to X11] [website](http://www.hboehm.info/gc/)
    • TCMalloc - Google's fast, multi-threaded malloc implementation. [Apache-2.0] [website](https://google.github.io/tcmalloc/)
    • jemalloc - General purpose malloc(3) implementation that emphasizes fragmentation avoidance and scalable concurrency support. [BSD] [website](http://jemalloc.net/)
    • memory-allocators - Custom memory allocators to improve the performance of dynamic memory allocation. [MIT]
    • Hoard - Fast, Scalable, and Memory-efficient Malloc for Linux, Windows, and Mac. [Apache-2.0] [website](http://hoard.org/)
    • rpmalloc - Cross platform lock free thread caching 16-byte aligned memory allocator implemented in C. [PublicDomain]
    • snmalloc - Message passing based high-performance allocator. [MIT]
    • tgc - A tiny garbage collector for C written in \~500 LOC. [BSD]
    • C Smart Pointers - Smart pointers for the (GNU) C programming language. [MIT]
    • buddy_alloc - A single header buddy memory allocator for C with bounded allocation costs. [0BSD]

  • Configuration

    • simpleini - Cross-platform C++ library providing a simple API to read and write INI-style configuration files. [MIT]
    • iniparser - INI file parser. [MIT]
    • inih - Simple .INI file parser in C, good for embedded systems. [BSD-3-Clause]
    • mINI - INI file reader and writer. [MIT]
    • inifile-cpp - A header-only and easy to use Ini file parser for C++. [MIT]
    • inipp - Simple header-only C++ ini parser and generator. [MIT]
    • toml11 - a C++11 (or later) header-only toml parser/encoder depending only on C++ standard library. [MIT]
    • toml++ - Header-only TOML parser and serializer for C++17 and later. [MIT] [website](https://marzer.github.io/tomlplusplus/)
    • libconfig - C, C++ library for processing structured configuration files. [LGPL-2.1] [website](https://hyperrealm.github.io/libconfig/)
    • inih - Single header only C++ version of [inih](https://github.com/benhoyt/inih). [BSD-3-Clause]
    • libconfuse - Small configuration file parser library for C. [ISC]
    • ini-cpp - Single header only C++ version, with some handy read/write interface, extend from [inih](https://github.com/benhoyt/inih). [BSD-3-Clause] [website](https://ssarcandy.tw/ini-cpp/index.html)

  • Sorting

    • cpp-sort - Sorting algorithms & related tools for C++14. [MIT]
    • pdqsort - Pattern-defeating quicksort. [zlib]
    • x86-simd-sort - C++ template library for high performance SIMD based sorting algorithms. [BSD-3-Clause]
    • Indiesort - A sort wrapper which enables the use of std::sort (& other random-access sort functions) with non-random-access containers, and also improves sort performance for large/non-trivially-copyable types in random-access containers and arrays. [zLib] [website](https://plflib.org/indiesort.htm)
    • Timsort - A templated stable sorting function which outperforms quicksort-based algorithms including std::sort, for reversed or semi-sorted data. [MIT]

  • Chemistry

    • Psi - An ab initio computational chemistry package. [GPL] [website](https://psicode.org/)
    • LAMMPS - A classical molecular dynamics code with a focus on materials modeling. It's an acronym for Large-scale Atomic/Molecular Massively Parallel Simulator. [GPL] [website](https://lammps.sandia.gov/)
    • MPQC - The Massively Parallel Quantum Chemistry program, MPQC, computes properties of atoms and molecules from first principles using the time independent Schrödinger equation. [GPL] [website](https://mpqc.org/)
    • gromacs - A message-passing parallel molecular dynamics implementation. [GPL] [website](http://www.gromacs.org)
    • Reaktoro - A computational framework in C++ and Python for modeling chemically reactive systems. [LGPL] [website](https://reaktoro.org)
    • d-SEAMS - A molecular dynamics trajectory analysis engine in C++ and Lua with Nix. It is an acronym for Deferred Structural Elucidation Analysis for Molecular Simulations. [GPL] [website](https://dseams.info)
    • MADNESS - Multiresolution Adaptive Numerical Environment for Scientific Simulation. [GPL] [website](https://github.com/m-a-d-n-e-s-s/madness)

  • Data visualization

    • matplotplusplus - C++ Graphics Library for Data Visualization. [MIT] [website](https://alandefreitas.github.io/matplotplusplus/)
    • mathplot - C++ header-only graphing and data visualization with modern OpenGL. [Apache-2.0] [website](https://sebsjames.github.io/mathplot/)
    • gplot++ - Cross-platform header-only C++ plotting library that interfaces with Gnuplot. [MIT]

  • Graph

    • Graaf - A general-purpose lightweight C++20 graph library. [MIT] [website](https://bobluppes.github.io/graaf/)
    • CXXGraph - free C++(17) graph header-only library for representation and algorithms execution. [AGPL-3.0]
Programming Languages
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