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

https://github.com/fffaraz/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

List: awesome-cpp

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A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny things. Inspired by awesome-... stuff.

Awesome Lists containing this project

README 

          
# Awesome C++ [![Awesome](https://awesome.re/badge.svg)](https://awesome.re) [![Track Awesome List](https://www.trackawesomelist.com/badge.svg)](https://www.trackawesomelist.com/fffaraz/awesome-cpp/)

A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny things. Inspired by awesome-... stuff.



- [Awesome C++  ](#awesome-c--)

	- [Standard Libraries](#standard-libraries)

	- [Frameworks](#frameworks)

	- [Artificial Intelligence](#artificial-intelligence)

	- [Asynchronous Event Loop](#asynchronous-event-loop)

	- [Audio](#audio)

	- [Biology](#biology)

	- [BitTorrent](#bittorrent)

	- [Chemistry](#chemistry)

	- [CLI](#cli)

	- [Compression](#compression)

	- [Concurrency](#concurrency)

	- [Configuration](#configuration)

	- [Containers](#containers)

	- [Cryptography](#cryptography)

	- [CSV](#csv)

	- [Database](#database)

	- [Data visualization](#data-visualization)

	- [Debug](#debug)

	- [Documentation](#documentation)

	- [DSP](#dsp)

	- [Font](#font)

	- [Game Engine](#game-engine)

	- [Graph](#graph)

	- [GUI](#gui)

	- [Graphics](#graphics)

	- [Image Processing](#image-processing)

	- [Internationalization](#internationalization)

	- [Inter-process communication](#inter-process-communication)

	- [JSON](#json)

	- [Logging](#logging)

	- [Machine Learning](#machine-learning)

	- [Math](#math)

	- [Memory Allocation](#memory-allocation)

	- [Multimedia](#multimedia)

	- [Networking](#networking)

	- [Office Open XML](#office-open-xml)

	- [PDF](#pdf)

	- [Physics](#physics)

	- [Reflection](#reflection)

	- [Regular Expression](#regular-expression)

	- [Robotics](#robotics)

	- [Scientific Computing](#scientific-computing)

	- [Scripting](#scripting)

	- [Serialization](#serialization)

	- [Serial Port](#serial-port)

	- [Sorting](#sorting)

	- [Video](#video)

	- [Virtual Machines](#virtual-machines)

	- [Web Application Framework](#web-application-framework)

	- [XML](#xml)

	- [Yaml](#yaml)

	- [Miscellaneous](#miscellaneous)

- [Software](#software)

	- [Compiler](#compiler)

	- [Online Compiler](#online-compiler)

	- [Debugger](#debugger)

	- [Integrated Development Environment](#integrated-development-environment)

	- [Build Systems](#build-systems)

	- [Static Code Analysis](#static-code-analysis)

	- [Coding Style Tools](#coding-style-tools)

- [Resources](#resources)

	- [API Design](#api-design)

	- [Articles](#articles)

	- [Books](#books)

	- [Coding Standards](#coding-standards)

	- [Coding Style](#coding-style)

	- [Podcasts](#podcasts)

	- [Talks](#talks)

	- [Videos](#videos)

	- [Websites](#websites)

	- [Weblogs](#weblogs)

	- [Other Awesome Projects](#other-awesome-projects)

- [Other Awesome Lists](#other-awesome-lists)

- [Jobs](#jobs)

- [Sponsors](#sponsors)

- [Contributing](#contributing)

			- [*If you see a project or link here that is no longer maintained or is not a good fit, please submit a pull request to improve this document. Thank you!*](#if-you-see-a-project-or-link-here-that-is-no-longer-maintained-or-is-not-a-good-fit-please-submit-a-pull-request-to-improve-this-document-thank-you)



## Standard Libraries

*C++ Standard Library - including STL Containers, STL Algorithm, STL Functional, etc.*



* [C++ Standard Library](https://en.wikipedia.org/wiki/C%2B%2B_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](https://en.wikipedia.org/wiki/Standard_Template_Library) - The Standard Template Library (STL).

* [C POSIX library](https://en.wikipedia.org/wiki/C_POSIX_library) - A specification of a C standard library for POSIX systems.

* [ISO C++ Standards Committee](https://github.com/cplusplus) - ISO/IEC JTC1/SC22/WG21 - The C++ Standards Committee. [website](http://www.open-std.org/JTC1/SC22/WG21/)

* [The GNU C Library](https://www.gnu.org/software/libc/manual) - The purpose of this manual is to tell you how to use the facilities of the GNU C Library.



## Frameworks

*C++ generic frameworks and libraries.*



* [abseil-cpp](https://github.com/abseil/abseil-cpp) - Abseil C++ Common Libraries. [Apache2]

* [Apache C++ Standard Library](http://stdcxx.apache.org/) - STDCXX, A collection of algorithms, containers, iterators, and other fundamental components. [retired] [Apache2]

* [APR](http://apr.apache.org/) - Apache Portable Runtime. Another library of cross-platform utility functions. [Apache2]

* [ASL](http://stlab.adobe.com/) - Adobe Source Libraries provides peer-reviewed and portable C++ source libraries. [MIT]

* [AUI](https://github.com/aui-framework/aui) - Declarative UI toolkit for C++20. [MPL2]

* [Boost](https://github.com/boostorg) :zap: - A large collection of generic C++ libraries. [Boost] [website](https://www.boost.org)

* [BDE](https://github.com/bloomberg/bde) - The BDE Development Environment from Bloomberg Labs. [Apache2]

* [C++ Workflow](https://github.com/sogou/workflow) :zap: - C++ Parallel Computing and Asynchronous Networking Engine. [Apache2]

* [CGraph](https://github.com/ChunelFeng/CGraph) - A cross-platform DAG framework based on C++ without any 3rd-party. [MIT]

* [Cinder](https://libcinder.org/) - A community-developed, free and open source library for professional-quality creative coding. [BSD]

* [Coost](https://github.com/idealvin/coost) - A tiny boost library in C++11. [MIT]

* [Cxxomfort](http://ryan.gulix.cl/fossil.cgi/cxxomfort/) - A small, header-only library that backports various facilities from more recent C++ Standards to C++03 and later. [MIT]

* [Dlib](https://github.com/davisking/dlib) :zap: - A toolkit for making real world machine learning and data analysis applications in C++. [Boost] [website](http://dlib.net/)

* [EASTL](https://github.com/electronicarts/EASTL) - Electronic Arts Standard Template Library. [BSD]

* [ETL](https://github.com/ETLCPP/etl) - Embedded Template Library. [MIT]

* [ffead-cpp](https://github.com/sumeetchhetri/ffead-cpp) - Framework for Enterprise Application Development. [Apache2]

* [Folly](https://github.com/facebook/folly) - An open-source C++ library developed and used at Facebook. [Apache2]

* [FunctionalPlus](https://github.com/Dobiasd/FunctionalPlus) - Functional Programming Library for C++. Write concise and readable C++ code. [MIT]

* [GLib](https://wiki.gnome.org/Projects/GLib) - GLib provides the core application building blocks for libraries and applications written in C. [LGPL]

* [itlib](https://github.com/iboB/itlib) - A collection of std-like single-header C++ libraries  [MIT]

* [JUCE](https://github.com/julianstorer/JUCE) - An all-encompassing C++ class library for developing cross-platform software. [Core-Module: ISC, Rest: GPL2/GPL3/Proprietary] [website](http://www.juce.com/)

* [Kigs framework](https://github.com/Kigs-framework/kigs) - A free and open source C++ modular multi-purpose cross platform RAD framework. [MIT] [website](https://kigs-framework.org/)

* [libPhenom](https://github.com/facebook/libphenom) - libPhenom is an eventing framework for building high performance and high scalability systems in C. [Apache2]

* [LibSourcey](https://github.com/sourcey/libsourcey) - C++11 evented IO for real-time video streaming and high performance networking applications. [LGPL]

* [LibU](https://github.com/koanlogic/libu) - A multiplatform utility library written in C. [BSD]

* [libxutils](https://github.com/kala13x/libxutils) - Simple and yet powerful cross-platform C library providing data structures, algorithms and much more. [MIT]

* [Loki](http://loki-lib.sourceforge.net/) - A C++ library of designs, containing flexible implementations of common design patterns and idioms. [MIT]

* [MiLi](https://github.com/MariadeAnton/MiLi) - Minimal headers-only C++ Library. [Boost]

* [OpenFrameworks](https://github.com/openframeworks/openFrameworks) - A cross platform open source toolkit for creative coding in C++. [MIT] [website](http://www.openframeworks.cc/)

* [PhotonLibOS](https://github.com/alibaba/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/)

* [Qt](https://github.com/qt) :zap: - A cross-platform application and UI framework. [GPL/LGPL/Proprietary] [website](https://www.qt.io)

* [Reason](http://code.google.com/p/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](https://root.cern.ch/) - 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]

* [rpp](https://github.com/TheNumbat/rpp) - Minimal Rust-inspired C++20 STL replacement. [MIT]

* [SaneCppLibraries](https://github.com/Pagghiu/SaneCppLibraries) - a set of C++ platform abstraction libraries for macOS, Windows and Linux. [MIT] [website](https://pagghiu.github.io/SaneCppLibraries/)

* [Seastar](https://github.com/scylladb/seastar) - An advanced, open-source C++ framework for high-performance server applications on modern hardware. [Apache-2.0 License] [seastar.io](http://seastar.io/)

* [Siv3D](https://github.com/Siv3D/OpenSiv3D) - Siv3D (OpenSiv3D) is a C++20 framework for creative coding (2D/3D games, media art, visualizers, and simulators). [MIT] [website](https://siv3d.github.io/)

* [STLport](http://www.stlport.org/) - An exemplary version of STL. [Free]

* [STXXL](http://stxxl.sourceforge.net/) - Standard Template Library for Extra Large Data Sets. [Boost]

* [tbox](https://github.com/tboox/tbox) - A glib-like multi-platform c library. [Apache2] [website](http://tboox.org/)

* [Ultimate++](http://www.ultimatepp.org/) - A C++ cross-platform rapid application development framework. [BSD]

* [Windows Template Library](http://sourceforge.net/projects/wtl/) - A C++ library for developing Windows applications and UI components. [Public]

* [xtd](https://github.com/gammasoft71/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]

* [Yomm2](https://github.com/jll63/yomm2) - Fast, Orthogonal, Open multi-methods. Supersedes [Yomm11](https://github.com/jll63/yomm11) [Boost]



## Artificial Intelligence



* [ANNetGPGPU](https://github.com/ANNetGPGPU/ANNetGPGPU) - A GPU (CUDA) based Artificial Neural Network library. [LGPL]

* [btsk](https://github.com/aigamedev/btsk) - Game Behavior Tree Starter Kit. [zlib]

* [Evolving Objects](http://eodev.sourceforge.net/) - A template-based, ANSI-C++ evolutionary computation library which helps you to write your own stochastic optimization algorithms insanely fast. [LGPL]

* [frugally-deep](https://github.com/Dobiasd/frugally-deep) - Header-only library for using Keras models in C++. [MIT]

* [Genann](https://github.com/codeplea/genann) - Simple neural network library in C. [zlib]

* [MXNet](https://github.com/apache/incubator-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)

* [PyTorch](https://github.com/pytorch/pytorch) - Tensors and Dynamic neural networks in Python with strong GPU acceleration. [website](https://pytorch.org)

* [flashlight](https://github.com/flashlight/flashlight) - Flashlight is a fast, flexible machine learning library written entirely in C++. [BSD]

* [Recast/Detour](https://github.com/recastnavigation/recastnavigation) - (3D) Navigation mesh generator and pathfinder, mostly for games. [zlib]

* [TensorFlow](https://github.com/tensorflow/tensorflow) - An open source software library for numerical computation using data flow graphs. [Apache]

* [Txeo](https://github.com/rdabra/txeo) - A modern C++ wrapper for TensorFlow. [Apache]

* [oneDNN](https://github.com/oneapi-src/oneDNN) - An open-source cross-platform performance library for deep learning applications. [Apache] [website](https://01.org/onednn)

* [CNTK](https://github.com/Microsoft/CNTK) - Microsoft Cognitive Toolkit (CNTK), an open source deep-learning toolkit. [Boost]

* [tiny-dnn](https://github.com/tiny-dnn/tiny-dnn) - A header only, dependency-free deep learning framework in C++11. [BSD]

* [Veles](https://github.com/Samsung/veles) - Distributed platform for rapid Deep learning application development. [Apache]

* [Kaldi](https://github.com/kaldi-asr/kaldi) - Toolkit for speech recognition. [Apache]



## Asynchronous Event Loop



* [Asio](https://github.com/chriskohlhoff/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/)

* [Boost.Asio](https://github.com/boostorg/asio) - A cross-platform C++ library for network and low-level I/O programming. [Boost] [website](https://boost.org/libs/asio)

* [C++ Actor Framework](https://github.com/actor-framework/actor-framework) - An Open Source Implementation of the Actor Model in C++. [BSD-3-Clause] [website](http://actor-framework.org/)

* [Ichor](https://github.com/volt-software/ichor) - An event queue which focuses on thread safety and provides dependency injection. [MIT]

* [libev](http://libev.schmorp.de/) - A full-featured and high-performance event loop that is loosely modelled after libevent, but without its limitations and bugs. [BSD and GPL]

* [libevent](http://libevent.org/) - An event notification library. [BSD]

* [libhv](https://github.com/ithewei/libhv) - Cross-platform event loop library. [BSD]

* [libuv](https://github.com/libuv/libuv) - Cross-platform asynchronous I/O. [BSD]

* [promise-cpp](https://github.com/xhawk18/promise-cpp) - Header only library that implements Promise/A+ standard. [Anti-996]

* [uvw](https://github.com/skypjack/uvw) - C++ wrapper for libuv. [MIT]

* [uv-cpp](https://github.com/wlgq2/uv-cpp) - a simple interface, high-performance network library based on C++11. [MIT]



## Audio

*Audio, Sound, Music, Digitized Voice Libraries*



* [Amplitude Audio SDK](https://github.com/SparkyStudios/AmplitudeAudioSDK) - A cross-platform audio engine designed with the needs of games in mind. [Apache-2.0] [website](https://amplitudeaudiosdk.com)

* [Aubio](https://github.com/aubio/aubio) - A library for audio and music analysis.[GPL-3.0] [website](https://aubio.org/)

* [AudioFile](https://github.com/adamstark/AudioFile) - A simple C++ library for reading and writing audio files. [MIT]

* [audioFlux](https://github.com/libAudioFlux/audioFlux) - A C library for audio and music analysis, feature extraction. [MIT]

* [dr_libs](https://github.com/mackron/dr_libs) - Single file audio decoding libraries for C and C++. [Unlicense]

* [FMOD](http://www.fmod.org/) - An easy to use crossplatform audio engine and audio content creation tool for games. [Free for non-commercial/Commercial]

* [KFR](https://www.kfrlib.com/) - Fast, modern C++ DSP framework, FFT, FIR/IIR filters, Sample Rate Conversion. [GPL/Proprietary]

* [LAME](https://lame.sourceforge.io/using.php) - LAME is a high quality MPEG Audio Layer III (MP3) encoder. [LGPL]

* [libsndfile](https://github.com/erikd/libsndfile/) - C library with C++ wrapper for reading and writing files containing sampled sound through one standard library interface. [LGPL-2.1] [website](http://www.mega-nerd.com/libsndfile/)

* [libsoundio](https://github.com/andrewrk/libsoundio) - C library for cross-platform real-time audio input and output. [MIT] [website](http://libsound.io/)

* [Maximilian](https://github.com/micknoise/Maximilian) - C++ Audio and Music DSP Library. [MIT]

* [OpenAL](http://www.openal.org/) - Open Audio Library - A crossplatform audio API. [BSD/LGPL/Proprietary]

* [miniaudio](https://github.com/mackron/miniaudio) - Single file audio playback and capture library. [Unlicense] [website](https://miniaud.io/)

* [ni-media](https://github.com/NativeInstruments/ni-media) - C++ library for reading and writing audio files. [MIT]

* [Opus](http://opus-codec.org/) - A totally open, royalty-free, highly versatile audio codec. [BSD]

* [PortAudio](http://www.portaudio.com/) - PortAudio is a free, cross-platform, open-source, audio I/O library. [MIT]

* [rnnoise](https://github.com/xiph/rnnoise) - Recurrent neural network for audio noise reduction. [BSD-3-Clause]

* [SELA](https://github.com/sahaRatul/sela) - SimplE Lossless Audio. [MIT]

* [SoLoud](https://github.com/jarikomppa/soloud) - Easy, portable audio engine for games. [zlib]

* [Speex](http://www.speex.org/) - A free codec for free speech. Obsoleted by Opus. [BSD]

* [Tonic](https://github.com/TonicAudio/Tonic) - Easy and efficient audio synthesis in C++. [Unlicense]

* [Vorbis](http://xiph.org/vorbis/) - Ogg Vorbis is a fully open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format. [BSD]

* [minimp3](https://github.com/lieff/minimp3) - Public domain, header-only MP3 decoder with clean-room implementation. [CC0]

* [Verovio](https://github.com/rism-ch/verovio) - Verovio is a fast and lightweight music notation engraving library. [LGPL] [website](https://www.verovio.org)

* [Wav2Letter++](https://github.com/facebookresearch/wav2letter/) - Public domain, a fast open source speech processing toolkit written entirely in C++ and uses the ArrayFire tensor library and the flashlight machine learning library for maximum efficiency. [BSD]



## Biology

*Bioinformatics, Genomics, Biotech*



* [BioC++](http://biocpp.sourceforge.net/) - C++ Computational Libraries for Bioinformatics. [BSD]

* [Chaste](http://www.cs.ox.ac.uk/chaste/) - An open source C++ library for the computational simulation of mathematical models developed for physiology and biology. [BSD]

* [libsequence](http://molpopgen.github.io/libsequence/) - A C++ library for representing and analyzing population genetics data. [GPL]

* [SeqAn](http://www.seqan.de/) - Algorithms and data structures for the analysis of sequences with the focus on biological data. [BSD/3-clause]

* [Vcflib](https://github.com/ekg/vcflib) - A C++ library for parsing and manipulating VCF files. [MIT]

* [Wham](https://github.com/zeeev/wham) - Structural variants (SVs) in Genomes by directly applying association tests to BAM files. [MIT]



## BitTorrent



* [jech/dht](https://github.com/jech/dht) - BitTorrent DHT library in C. [MIT]

* [libtorrent](https://github.com/arvidn/libtorrent) (a.k.a. libtorrent-rasterbar) - An efficient feature complete C++ bittorrent implementation. [BSD]

* [LibTorrent](https://github.com/rakshasa/libtorrent) (a.k.a. libtorrent-rakshasa) - BitTorrent library. [GPL]

* [libutp](https://github.com/bittorrent/libutp) - uTorrent Transport Protocol library. [MIT]



## Chemistry

*Chemistry, Quantum Chemistry, Solid-State Chemistry/Physics, Geochemistry, Biochemistry*



* [d-SEAMS](https://github.com/d-SEAMS/seams-core) - 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)

* [gromacs](https://github.com/gromacs/gromacs) - A message-passing parallel molecular dynamics implementation. [GPL] [website](http://www.gromacs.org)

* [Reaktoro](https://github.com/reaktoro/reaktoro) - A computational framework in C++ and Python for modeling chemically reactive systems. [LGPL] [website](https://reaktoro.org)

* [LAMMPS](https://github.com/lammps/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/)

* [MADNESS](https://github.com/m-a-d-n-e-s-s/madness) - Multiresolution Adaptive Numerical Environment for Scientific Simulation. [GPL] [website](https://github.com/m-a-d-n-e-s-s/madness)

* [MPQC](https://github.com/ValeevGroup/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/)

* [Psi](https://github.com/psi4/psi4) - An ab initio computational chemistry package. [GPL] [website](https://psicode.org/)



## CLI

*Console/Terminal User Interface, Command Line Interface*



 * [Argh!](https://github.com/adishavit/argh) - A minimalist, frustration-free, header-only argument handler. [BSD]

 * [argparse](https://github.com/p-ranav/argparse) - Argument Parser for Modern C++. [MIT]

 * [args](https://github.com/taywee/args) - A simple header-only C++ argument parser library. [MIT]

 * [Argy](https://github.com/mshenoda/argy) - Command-Line Argument Parsing Library for Modern C++ — Simple, Intuitive, and Header-only with Zero Dependencies [MIT]

 * [barkeep](https://github.com/oir/barkeep) - Small C++ header to display async animations, counters, and progress bars. [Apache-2.0] [website](https://oir.github.io/barkeep/)

 * [Boost.Program_options](https://github.com/boostorg/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)

 * [cli](https://github.com/daniele77/cli) - A cross-platform header only C++14 library for interactive command line interfaces (Cisco style). [Boost]

 * [CLI11](https://github.com/CLIUtils/CLI11) - Header only single or multi-file C++11 library for simple and advanced CLI parsing. [BSD]

 * [clipp](https://github.com/muellan/clipp) - Easy to use, powerful and expressive command line argument handling for C++11/14/17 contained in a single header file. [MIT]

 * [cpp-terminal](https://github.com/jupyter-xeus/cpp-terminal) - Small header only C++ library for writing multiplatform terminal applications. [MIT]

 * [Ctrl+C](https://github.com/evgenykislov/ctrl-c) - Crossplatform C++11 library to handle Ctrl+C event in custom functions. [MIT]

 * [cxxopts](https://github.com/jarro2783/cxxopts) - Lightweight C++ command line option parser. [MIT]

 * [docopt.cpp](https://github.com/docopt/docopt.cpp) - A library to generate option parser from docstring. [MIT/Boost]

 * [FINAL CUT](https://github.com/gansm/finalcut) - Library for creating terminal applications with text-based widgets. [LGPL]

 * [FTXUI](https://github.com/ArthurSonzogni/FTXUI) - C++ Functional Terminal User Interface. [MIT]

 * [gflags](https://gflags.github.io/gflags/) - Commandline flags module for C++. [BSD]

 * [imtui](https://github.com/ggerganov/imtui) - Immediate Mode Text-based User Interface. [MIT]

 * [indicators](https://github.com/p-ranav/indicators/) - Activity indicators for Modern C++. [MIT]

 * [linenoise](https://github.com/antirez/linenoise) - A small self-contained alternative to readline and libedit. [BSD-2-Clause]

 * [linenoise-ng](https://github.com/arangodb/linenoise-ng) - A small, portable GNU readline replacement for Linux, Windows and MacOS which is capable of handling UTF-8 characters. [BSD]

 * [Lyra](https://github.com/bfgroup/Lyra) - A simple to use, composable, command line parser for C++ 11 and beyond. [Boost]

 * [Ncurses](http://invisible-island.net/ncurses/) - A terminal user interface. [MIT]

 * [oof](https://github.com/s9w/oof) - Convenient, high-performance RGB color and position control for console output. [MIT]

 * [PDCurses](https://github.com/wmcbrine/PDCurses) - Public domain curses library with both source code and pre-compiled library available. [PublicDomain]

 * [popl](https://github.com/badaix/popl) - A single-header templated command line arguments and ini file parser for C++ 11 and beyond. [MIT]

 * [replxx](https://github.com/AmokHuginnsson/replxx) - A readline and libedit replacement that supports UTF-8, syntax highlighting, hints, works on Unix and Windows. [BSD]

 * [tabulate](https://github.com/p-ranav/tabulate) - Table Maker for Modern C++. [MIT]

 * [TCLAP](http://tclap.sourceforge.net) - A mature, stable and feature-rich library for defining and accessing command line arguments in ANSI C++. [MIT]

 * [termbox](https://github.com/nsf/termbox) - A C library for writing text-based user interfaces. [MIT]

 * [TermOx](https://github.com/a-n-t-h-o-n-y/TermOx) - C++17 Terminal User Interface(TUI) Library. [MIT]

 * [tuibox](https://github.com/Cubified/tuibox) - A single-header terminal UI (TUI) library, capable of creating mouse-driven, interactive applications on the command line. [MIT]



## Compression

*Compression and Archiving Libraries*



* [bit7z](https://github.com/rikyoz/bit7z) - A C++ static library offering a clean and simple interface to the 7-zip shared libraries. [MPL2]

* [Brotli](https://github.com/google/brotli) - Brotli compression format. Developed by Google. [MIT]

* [bzip2](http://www.bzip.org/) - A freely available, patent free, high-quality data compressor. [BSD]

* [bzip3](https://github.com/kspalaiologos/bzip3) - A better and stronger spiritual successor to BZip2. [LGPL]

* [FastLZ](https://github.com/ariya/FastLZ) - Small & portable byte-aligned LZ77 compression. [MIT]

* [FiniteStateEntropy](https://github.com/Cyan4973/FiniteStateEntropy) - New generation entropy codecs : Finite State Entropy and Huff0.

* [heatshrink](https://github.com/atomicobject/heatshrink) - data compression library for embedded/real-time systems  [ISC]

* [Kanzi](https://github.com/flanglet/kanzi-cpp) - a modern, modular, portable and efficient lossless data compressor implemented in C++. [Apache-2.0]

* [KArchive](https://api.kde.org/frameworks/karchive/html/index.html) - 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]

* [libarchive](https://github.com/libarchive/libarchive) - Multi-format archive and compression library. [New BSD] [website](http://www.libarchive.org/)

* [LZ4](https://github.com/lz4/lz4) - Extremely Fast Compression algorithm. [BSD] [website](http://www.lz4.org/)

* [LZFSE](https://github.com/lzfse/lzfse) - LZFSE compression library and command line tool. Developed by Apple.

* [LZHAM](https://code.google.com/p/lzham/) - Lossless data compression library with a compression ratio similar to LZMA but with much faster decompression. [BSD]

* [LZMA](https://sourceforge.net/projects/sevenzip/files/7-Zip) :zap: - The default and general compression method of 7z format. [PublicDomain] [website](https://www.7-zip.org)

* [LZMAT](http://www.matcode.com/lzmat.htm) - An extremely fast real-time lossless data compression library. [GPL]

* [miniz](https://github.com/richgel999/miniz) - Single C source file Deflate/Inflate compression library with zlib-compatible API, ZIP archive reading/writing, PNG writing. [MIT]

* [Minizip](https://github.com/nmoinvaz/minizip) - Zlib with latest bug fixes that supports PKWARE disk spanning, AES encryption, and IO buffering. [zlib]

* [minizip-ng](https://github.com/zlib-ng/minizip-ng) - Fork of the popular zip manipulation library found in the zlib distribution. [zlib]

* [PhysicsFS](https://icculus.org/physfs/) - 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]

* [Rapidgzip](https://github.com/mxmlnkn/rapidgzip) - Gzip Decompression and Random Access for Modern Multi-Core Machines. [Apache-2/MIT]

* [smaz](https://github.com/antirez/smaz) - Small strings compression library. [BSD]

* [Snappy](https://google.github.io/snappy/) - A fast compressor/decompressor. [BSD]

* [ZLib](http://zlib.net/) - A very compact compression library for data streams. [zlib]

* [zlib-ng](https://github.com/zlib-ng/zlib-ng) - zlib for the "next generation" systems. Drop-In replacement with some serious optimizations. [zlib]

* [zstd](https://github.com/facebook/zstd) - Zstandard - Fast real-time compression algorithm. Developed by Facebook. [BSD]

* [ZZIPlib](http://zziplib.sourceforge.net/) - Provides read access on ZIP-archives. [MPL/LGPL]



## Concurrency

*Concurrency and Multithreading*



* [alpaka](https://github.com/ComputationalRadiationPhysics/alpaka) - Abstraction library for parallel kernel acceleration. [LGPLv3+]

* [ArrayFire](https://github.com/arrayfire/arrayfire) - A general purpose GPU library. [BSD]

* [Async++](https://github.com/Amanieu/asyncplusplus) - A lightweight concurrency framework for C++11, inspired by the Microsoft PPL library and the N3428 C++ standard proposal. [MIT]

* [Boost.Compute](https://github.com/boostorg/compute) - A C++ GPU Computing Library for OpenCL. [Boost] [website](https://boost.org/libs/compute)

* [Bolt](https://github.com/HSA-Libraries/Bolt) - A C++ template library optimized for GPUs. [Apache2]

* [BS::thread_pool](https://github.com/bshoshany/thread-pool) - A fast, lightweight, and easy-to-use C++17 thread pool library [MIT]

* [Channel](https://github.com/andreiavrammsd/cpp-channel) - Thread-safe container for sharing data between threads. [MIT]

* [ck](https://github.com/concurrencykit/ck) - Concurrency primitives, safe memory reclamation mechanisms and non-blocking data structures. [BSD]

* [concurrentqueue](https://github.com/cameron314/concurrentqueue) - A fast multi-producer, multi-consumer lock-free concurrent queue for C++11. [BSD,Boost]

* [Coros](https://github.com/mtmucha/coros) - An easy-to-use and fast library for task-based parallelism, utilizing coroutines. [BSL-1.0]

* [CUB](https://github.com/NVlabs/cub) - CUB provides state-of-the-art, reusable software components for every layer of the CUDA programming mode. [New BSD]

* [cuda-api-wrappers](https://github.com/eyalroz/cuda-api-wrappers) - Lightweight, Modern-C++ wrappers for the CUDA GPU programming runtime API. [BSD]

* [cupla](https://github.com/ComputationalRadiationPhysics/cupla) - C++ API to run CUDA/C++ on OpenMP, Threads, TBB, ... through Alpaka. [LGPLv3+]

* [C++React](https://github.com/schlangster/cpp.react) - A reactive programming library for C++11. [Boost]

* [FiberTaskingLib](https://github.com/RichieSams/FiberTaskingLib) - Task-based multi-threading library that supports task graphs with arbitrary dependencies. [Apache]

* [HPX](https://github.com/STEllAR-GROUP/hpx/) - A general purpose C++ runtime system for parallel and distributed applications of any scale. [Boost]

* [Intel Games Task Scheduler](https://github.com/GameTechDev/GTS-GamesTaskScheduler) - A task scheduling framework designed for the needs of game developers. [MIT]

* [Intel Parallel STL](https://github.com/intel/parallelstl) - Intel® implementation of C++17 STL for C++11 and above. [Apache2]

* [Intel TBB](https://www.threadingbuildingblocks.org/) - Intel® Threading Building Blocks. [Apache2]

* [junction](https://github.com/preshing/junction) - A library of concurrent data structures in C++. [BSD]

* [Kokkos](https://github.com/kokkos/kokkos) - A performance portable programming model for parallel execution and memory abstraction. [BSD]

* [libcds](https://github.com/khizmax/libcds) - A C++ library of Concurrent Data Structures. [BSD]

* [Libclsph](https://github.com/libclsph/libclsph) - An OpenCL based GPU accelerated SPH fluid simulation library. [MIT]

* [libdill](https://github.com/sustrik/libdill/) - Introduces structured concurrency in C. [MIT]

* [libdispatch](https://github.com/apple/swift-corelibs-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/)

* [libfork](https://github.com/ConorWilliams/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/)

* [libmill](https://github.com/sustrik/libmill/) - Introduces Go-style concurrency in C. [MIT]

* [marl](https://github.com/google/marl) - Marl is a hybrid thread / fiber task scheduler written in C++ 11. [Apache-2.0]

* [moderngpu](https://github.com/moderngpu/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](https://github.com/NVIDIA/nccl) - Optimized primitives for collective multi-GPU communication. [BSD]

* [Neco](https://github.com/tidwall/neco) - Concurrency library for C (coroutines). [MIT]

* [OpenCL](https://www.khronos.org/opencl/) - The open standard for parallel programming of heterogeneous systems.

* [OpenMP](http://openmp.org/) - The OpenMP API.

* [rotor](https://github.com/basiliscos/cpp-rotor) - Event loop friendly C++ actor micro framework. [MIT]

* [SObjectizer](https://github.com/Stiffstream/sobjectizer) - An implementation of Actor, Publish-Subscribe, and CSP models in one rather small C++ framework. [BSD-3-Clause]

* [Quantum](https://github.com/bloomberg/quantum) - A powerful C++ coroutine dispatcher framework built on top of [Boost.Coroutine2](https://boost.org/libs/coroutine2).

* [RaftLib](http://raftlib.io/) - The RaftLib C++ library, streaming/dataflow concurrency via C++ iostream-like operators. [Apache2]

* [readerwriterqueue](https://github.com/cameron314/readerwriterqueue) - A fast single-producer, single-consumer lock-free queue for C++. [BSD]

* [stdgpu](https://github.com/stotko/stdgpu) - Efficient STL-like Data Structures on the GPU. [Apache2]

* [Taskflow](https://github.com/taskflow/taskflow) - A General-purpose Parallel and Heterogeneous Task Programming System. (renamed from Cpp-Taskflow) [MIT]

* [ThreadPool](https://github.com/progschj/ThreadPool) - A simple C++11 Thread Pool implementation [zlib]

* [Thrust](http://thrust.github.io/) - A parallel algorithms library which resembles the C++ Standard Template Library (STL). [Apache2]

* [transwarp](https://github.com/bloomen/transwarp) - A header-only C++ library for task concurrency. [MIT]

* [VexCL](https://github.com/ddemidov/vexcl) - A C++ vector expression template library for OpenCL/CUDA. [MIT]

* [STAPL](http://parasol-lab.gitlab.io/stapl-home/) - A C++ parallel programming framework designed to work on both shared and distributed memory parallel computers. [BSD]

* [concurrencpp](https://github.com/David-Haim/concurrencpp) - A general concurrency library containing tasks, executors, timers and C++20 coroutines to rule them all.



## Configuration

*Configuration files, INI files*



* [inifile-cpp](https://github.com/Rookfighter/inifile-cpp) - A header-only and easy to use Ini file parser for C++. [MIT]

* [inih](https://github.com/benhoyt/inih) - Simple .INI file parser in C, good for embedded systems. [BSD-3-Clause]

* [inih](https://github.com/jtilly/inih) - Single header only C++ version of [inih](https://github.com/benhoyt/inih). [BSD-3-Clause]

* [ini-cpp](https://github.com/SSARCandy/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)

* [iniparser](https://github.com/ndevilla/iniparser) - INI file parser. [MIT]

* [inipp](https://github.com/mcmtroffaes/inipp) - Simple header-only C++ ini parser and generator. [MIT]

* [libconfig](https://github.com/hyperrealm/libconfig) - C, C++ library for processing structured configuration files. [LGPL-2.1] [website](https://hyperrealm.github.io/libconfig/)

* [libconfuse](https://github.com/martinh/libconfuse) - Small configuration file parser library for C. [ISC]

* [mINI](https://github.com/metayeti/mINI) - INI file reader and writer. [MIT]

* [simpleini](https://github.com/brofield/simpleini) - Cross-platform C++ library providing a simple API to read and write INI-style configuration files. [MIT]

* [toml++](https://github.com/marzer/tomlplusplus) - Header-only TOML parser and serializer for C++17 and later. [MIT] [website](https://marzer.github.io/tomlplusplus/)

* [toml11](https://github.com/ToruNiina/toml11) -  a C++11 (or later) header-only toml parser/encoder depending only on C++ standard library. [MIT]



## Containers



* [C++ B-tree](https://github.com/algorithm-ninja/cpp-btree) - A template library that implements ordered in-memory containers based on a B-tree data structure. [Apache2]

* [dynamic_bitset](https://github.com/pinam45/dynamic_bitset) - Simple Useful Libraries: C++17/20 header-only dynamic bitset. [MIT] [website](https://pinam45.github.io/dynamic_bitset/)

* [fixed-containers](https://github.com/teslamotors/fixed-containers) - Header-only C++20 library that provides fixed capacity constexpr containers. [MIT]

* [flat_hash_map](https://github.com/skarupke/flat_hash_map) - A very fast flat hashtable with Fibonacci hashing.

* [frozen](https://github.com/serge-sans-paille/frozen) - a header-only, constexpr alternative to gperf for C++14 users. [Apache-2.0]

* [Hashmaps](https://github.com/goossaert/hashmap) - Implementation of open addressing hash table algorithms in C++. [MIT]

* [hat-trie](https://github.com/Tessil/hat-trie) - C++ implementation of a fast and memory efficient HAT-trie. [MIT]

* [Hopscotch map](https://github.com/Tessil/hopscotch-map) - A fast header-only hash map which uses hopscotch hashing for collisions resolution. [MIT]

* [librb](https://github.com/mlyszczek/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/)

* [LSHBOX](https://github.com/RSIA-LIESMARS-WHU/LSHBOX) - A c++ toolbox of locality-sensitive hashing (LSH), provides several popular LSH algorithms, also support Python and MATLAB. [GPL]

* [parallel-hashmap](https://github.com/greg7mdp/parallel-hashmap) - A family of header-only, very fast and memory-friendly hashmap and btree containers [Apache2] [website](https://greg7mdp.github.io/parallel-hashmap/)

* [PGM-index](https://github.com/gvinciguerra/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)

* [plf::colony](https://github.com/mattreecebentley/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)

* [plf::list](https://github.com/mattreecebentley/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)

* [plf::stack](https://github.com/mattreecebentley/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)

* [ring_span lite](https://github.com/martinmoene/ring-span-lite) - A simplified implementation of Arthur O'Dwyer's ring_span implementation ie. a circular buffer view. [MIT]

* [robin-hood-hashing](https://github.com/martinus/robin-hood-hashing) - Fast & memory efficient hashtable based on robin hood hashing for C++14. [MIT]

* [robin-map](https://github.com/Tessil/robin-map) - Fast hash map and hash set using robin hood hashing. [MIT]

* [sparsepp](https://github.com/greg7mdp/sparsepp) - A fast, memory efficient hash map for C++. [BSD 3-clause]

* [sqlitemap](https://github.com/bw-hro/sqlitemap) - Persistent map backed by SQLite. [MIT]

* [st_tree](https://github.com/erikerlandson/st_tree) - A fast and flexible c++ template class for tree data structures. [Apache-2.0]

* [svector](https://github.com/martinus/svector) - Compact SVO optimized vector for C++17 or higher. [MIT]

* [tree.hh](https://github.com/kpeeters/tree.hh) - An STL-like C++ header-only tree library. [GPL2+]

* [unordered_dense](https://github.com/martinus/unordered_dense) - A fast & densely stored hashmap and hashset based on robin-hood backward shift deletion. [MIT]



## Cryptography

*Cryptography and Encryption Libraries*



* [Bcrypt](http://bcrypt.sourceforge.net/) - A cross platform file encryption utility. Encrypted files are portable across all supported operating systems and processors. [BSD]

* [BeeCrypt](http://beecrypt.sourceforge.net/) - A portable and fast cryptography library. [LGPLv2.1+]

* [Botan](http://botan.randombit.net/) - A crypto library for C++. [BSD-2]

* [Crypto++](https://github.com/weidai11/cryptopp) - A free C++ class library of cryptographic schemes. [Boost] [website](http://www.cryptopp.com/)

* [digestpp](https://github.com/kerukuro/digestpp) - C++11 header-only message digest (hash) library. [PublicDomain]

* [GnuPG](https://www.gnupg.org/) - A complete and free implementation of the OpenPGP standard. [GPL]

* [GnuTLS](http://www.gnutls.org/) - A secure communications library implementing the SSL, TLS and DTLS protocols. [LGPL2.1]

* [Libgcrypt](http://www.gnu.org/software/libgcrypt/) - A general purpose cryptographic library originally based on code from GnuPG. [LGPLv2.1+]

* [LibreSSL](http://www.libressl.org/) - A free version of the SSL/TLS protocol forked from OpenSSL in 2014. [?]

* [libsodium](https://github.com/jedisct1/libsodium) - P(ortable|ackageable) NaCl-based crypto library, opinionated and easy to use. [ISC]

* [libhydrogen](https://github.com/jedisct1/libhydrogen) - A lightweight, secure, easy-to-use crypto library suitable for constrained environments. [ISC]

* [LibTomCrypt](https://github.com/libtom/libtomcrypt) - A fairly comprehensive, modular and portable cryptographic toolkit. [WTFPL]

* [mbedTLS](https://github.com/ARMmbed/mbedtls) - An open source, portable, easy to use, readable and flexible SSL library, previously known as PolarSSL. [Apache2] [website](https://tls.mbed.org/)

* [Nettle](http://www.lysator.liu.se/~nisse/nettle/) - A low-level cryptographic library. [LGPL]

* [OpenSSL](https://github.com/openssl/openssl) - A robust, commercial-grade, full-featured, and Open Source cryptography library. [Apache] [website](http://www.openssl.org/)

* [retter](https://github.com/MaciejCzyzewski/retter) - A collection of hash functions, ciphers, tools, libraries, and materials related to cryptography.

* [s2n](https://github.com/awslabs/s2n) - An implementation of the TLS/SSL protocols. [Apache]

* [sha1collisiondetection](https://github.com/cr-marcstevens/sha1collisiondetection) - Library and command line tool to detect SHA-1 collision in a file. [MIT]

* [Tink](https://github.com/google/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]

* [Tiny AES in C](https://github.com/kokke/tiny-AES-c) - Small portable AES128/192/256 in C. [PublicDomain]

* [Themis](https://github.com/cossacklabs/themis) - crypto library for painless data security, providing symmetric and asymmetric encryption, secure sockets with forward secrecy, for mobile and server platforms. [Apache2]

* [HEhub](https://github.com/primihub/HEhub) - A library for homomorphic encryption and its applications. [Apache2]



## CSV

*Libraries for parsing Comma Separated Value (CSV) files*



* [commata](https://github.com/furfurylic/commata) - Just another header-only C++17 CSV parser. [Unlicense]

* [csv2](https://github.com/p-ranav/csv2) - Fast CSV parser for modern C++. [MIT]

* [Csv::Parser](https://github.com/ashaduri/csv-parser) - Compile-time and runtime CSV parser written in C++17. [Zlib]

* [Fast C++ CSV Parser](https://github.com/ben-strasser/fast-cpp-csv-parser) - Small, easy-to-use and fast header-only library for reading CSV files. [BSD-3-Clause]

* [Glaze](https://github.com/stephenberry/glaze) - High performance, header only, CSV library with reflection support. [MIT]

* [lazycsv](https://github.com/ashtum/lazycsv) - A fast, lightweight and single-header csv parser for modern C++. [MIT]

* [rapidcsv](https://github.com/d99kris/rapidcsv) - An easy-to-use, header-only C++ CSV parser library. [BSD-3-Clause]

* [ssp](https://github.com/red0124/ssp) - A header only "csv" parser which is fast and versatile with modern C++ api. [MIT]

* [Vince's CSV Parser](https://github.com/vincentlaucsb/csv-parser) - A fast, self-contained, streaming C++17 CSV parser with optional type-casting and statistics. [MIT]

* [zsv](https://github.com/liquidaty/zsv) - The world's fastest (simd) CSV parser, with an extensible CLI. [MIT]



## Database

*Database Libraries, SQL Servers, ODBC Drivers, and Tools*



* [ClickHouse](https://github.com/ClickHouse/clickhouse-cpp) - C++ client for ClickHouse DBMS. [Apache2]

* [CrossDB](https://github.com/crossdb-org/crossdb) - Ultra High-performance Lightweight Embedded and Server OLTP RDBMS. [MPL-2.0] [website](https://crossdb.org/)

* [DuckDB](https://duckdb.org/) - in-process SQL OLAP Database Management System. [MIT] [website](https://duckdb.org/)

* [hiberlite](https://github.com/paulftw/hiberlite) - C++ Object-relational mapping for sqlite3. [BSD]

* [Hiredis](https://github.com/redis/hiredis) - A minimalistic C client library for the Redis database. [BSD]

* [Infinity](https://github.com/infiniflow/infinity) - The AI-native database built for LLM applications, providing incredibly fast vector and full-text search. [Apache2]

* [Kuzu](https://github.com/kuzudb/kuzu) - Embeddable property graph database management system built for query speed and scalability. Implements Cypher. [MIT] [website](https://kuzudb.com/)

* [Kvrocks](https://github.com/apache/incubator-kvrocks) - A distributed key value NoSQL database that uses RocksDB as storage engine and is compatible with Redis protocol. [Apache2]

* [LevelDB](https://github.com/google/leveldb) - A fast key-value storage library written at Google that provides an ordered mapping from string keys to string values. [BSD]

* [libpg_query](https://github.com/pganalyze/libpg_query) - C library for accessing the PostgreSQL parser outside of the server environment. [BSD-3-Clause]

* [libpqxx](https://github.com/jtv/libpqxx) - The official C++ client API for PostgreSQL. [BSD-3-Clause]

* [LMDB](https://www.symas.com/lmdb) - Very fast embedded key/value store with full ACID semantics. [OpenLDAP]

* [LMDB++](https://github.com/bendiken/lmdbxx) - C++11 wrapper for the LMDB embedded database library. [PublicDomain]

* [mgclient](https://github.com/memgraph/mgclient) - C/C++ Memgraph Client. [Apache2]

* [MongoDB C Driver](https://github.com/mongodb/mongo-c-driver) - MongoDB client library for C. [Apache2]

* [MongoDB C++ Driver](https://github.com/mongodb/mongo-cxx-driver) - C++ driver for MongoDB. [Apache2]

* [MongoDB Libbson](https://github.com/mongodb/libbson) - A BSON utility library. [Apache2]

* [MySQL++](http://www.tangentsoft.net/mysql++/) - A C++ wrapper for MySQL's C API. [LGPL]

* [nanodbc](https://github.com/nanodbc/nanodbc) - A small C++ wrapper for the native C ODBC API. [MIT]

* [ODB](https://www.codesynthesis.com/products/odb/) - An open-source, cross-platform, and cross-database object-relational mapping (ORM) system for C++. [GPLv2]

* [redis3m](https://github.com/luca3m/redis3m) - Wrapper of hiredis with clean C++ interface, supporting sentinel and ready to use patterns. [Apache2]

* [Reindexer](https://github.com/Restream/reindexer) - Embeddable, in-memory, document-oriented database with a high-level Query builder interface. [Apache2] [website](https://reindexer.io/)

* [RocksDB](https://github.com/facebook/rocksdb) - Embedded key-value store for fast storage from facebook. [BSD]

* [SimDB](https://github.com/LiveAsynchronousVisualizedArchitecture/simdb) - High performance, shared memory, lock free, cross platform, single file, minimal dependencies, C++11 key-value store. [Apache2]

* [SOCI](https://github.com/SOCI/soci) - A database abstraction layer for C++. [Boost]

* [Speedb](https://github.com/speedb-io/speedb) - Community-led project: A RocksDB compliant high performance scalable embedded key-value store. [Apache2]

* [SQLite](http://www.sqlite.org/) - A completely embedded, full-featured relational database in a few 100k that you can include right into your project. [PublicDomain]

* [SQLiteC++](https://github.com/SRombauts/SQLiteCpp) - SQLiteC++ (SQLiteCpp) is a smart and easy to use C++ SQLite3 wrapper. [MIT]

* [sqlite_modern_cpp](https://github.com/SqliteModernCpp/sqlite_modern_cpp) - Header only C++14 wrapper around sqlite library. [MIT]

* [sqlite_orm](https://github.com/fnc12/sqlite_orm) - SQLite ORM light header only library for modern C++. [AGPL + paid MIT]

* [sqlpp11](https://github.com/rbock/sqlpp11) - A type safe embedded domain specific language for SQL queries and results in C++. [BSD-2-Clause]

* [TidesDB](https://github.com/tidesdb/tidesdb) - High-performance, durable, transactional embedded storage engine designed for flash and RAM optimization. [MPL-2.0] [website](https://tidesdb.com/)

* [TileDB](https://github.com/TileDB-Inc/TileDB) - Fast Dense and Sparse Multidimensional Array DBMS. [MIT] [website](https://tiledb.io/)

* [TinyORM](https://github.com/silverqx/TinyORM) - Modern C++ ORM library. [MIT] [website](https://www.tinyorm.org/)

* [UnQLite](https://github.com/symisc/unqlite) - A self-contained, serverless, zero-configuration, transactional NoSQL engine. [BSD-2-Clause] [website](https://unqlite.symisc.net/)

* [upscaledb](https://upscaledb.com) - An embedded "typed" key/value store with a built-in query interface. [GPLv3]

* [TigerBeetleDB C++ client (Community)](https://github.com/kassane/tigerbeetle-cpp) - TigerBeetle is a financial accounting database designed for mission critical safety and performance to power the future of financial services. [BSL-1.0]

* [Trilogy](https://github.com/trilogy-libraries/trilogy) - a client library for MySQL-compatible database servers, designed for performance, flexibility, and ease of embedding. [MIT]

* [UStore](https://github.com/unum-cloud/ustore) - Multi-Modal database for BLOBs, JSON, and graphs. [Apache2]

* [Velox](https://github.com/facebookincubator/velox) - A C++ vectorized database acceleration library aimed to optimizing query engines and data processing systems. [Apache-2.0] [website](https://velox-lib.io/)



## Data visualization

*Data visualization Libraries*



* [gplot++](https://github.com/ziotom78/gplotpp) - Cross-platform header-only C++ plotting library that interfaces with Gnuplot. [MIT]

* [matplotplusplus](https://github.com/alandefreitas/matplotplusplus) - C++ Graphics Library for Data Visualization. [MIT] [website](https://alandefreitas.github.io/matplotplusplus/)

* [mathplot](https://github.com/sebsjames/mathplot) - C++ header-only graphing and data visualization with modern OpenGL. [Apache-2.0] [website](https://sebsjames.github.io/mathplot/)



## Debug

*Debugging Libraries, Memory Leak and Resource Leak Detection, Unit Testing*



* [backward-cpp](https://github.com/bombela/backward-cpp) - A beautiful stack trace pretty printer for C++. [MIT]

* [Bencher](https://bencher.dev/) - A suite of continuous benchmarking tools designed to catch performance regressions in CI. [MIT]/[Apache2]

* [benchmark](https://github.com/google/benchmark) - Google provided small microbenchmark support library. [Apache2]

* [Boost.Test](https://github.com/boostorg/test) - Boost Test Library. [Boost] [website](https://boost.org/libs/test)

* [check](https://github.com/libcheck/check) - Check is a unit testing framework for C. [LGPL-2.1] [website](https://libcheck.github.io/check/)

* [doctest](https://github.com/onqtam/doctest) - The lightest feature rich C++ single header testing framework. [MIT]

* [Catch2](https://github.com/catchorg/Catch2) - A modern, C++-native, test framework for unit-tests, TDD and BDD. [Boost]

* [Celero](https://github.com/DigitalInBlue/Celero) - C++ Benchmarking Framework. [Apache2]

* [cpp-dump](https://github.com/philip82148/cpp-dump) - A C++ library for debugging purposes that can print any variable, even user-defined types. [MIT]

* [CppUTest](https://github.com/cpputest/cpputest) - Unit testing and mocking framework for C/C++. [BSD-3-clause]

* [CUTE](http://cute-test.com) - C++ Unit Testing Easier. [LGPL3]

* [CMocka](https://cmocka.org/) - unit testing framework for C with support for mock objects. [Apache2]

* [CppBenchmark](https://github.com/chronoxor/CppBenchmark) - Performance benchmark framework for C++ with nanoseconds measure precision. [MIT]

* [Cpptrace](https://github.com/jeremy-rifkin/cpptrace) - A simple, portable, and self-contained C++ stacktrace library supporting C++11 and greater. [MIT]

* [CppUnit](http://www.freedesktop.org/wiki/Software/cppunit/) - C++ port of JUnit. [LGPL2]

* [CrashCatch](https://github.com/keithpotz/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)

* [CTest](https://cmake.org/cmake/help/v2.8.8/ctest.html) - The CMake test driver program. [BSD]

* [dbg-macro](https://github.com/sharkdp/dbg-macro) - A dbg(…) macro for C++. [MIT]

* [DebugViewPP](https://github.com/CobaltFusion/DebugViewPP) - Debug logging viewer. [Boost]

* [Deleaker](http://www.deleaker.com) - A tool for resource leak detection, including memory, GDI and handle leaks.

* [FakeIt](https://github.com/eranpeer/FakeIt) - Simple mocking framework for C++. [MIT]

* [fff](https://github.com/meekrosoft/fff) - A micro-framework for creating fake C functions. [MIT]

* [Google Mock](https://github.com/google/googletest/blob/master/googlemock/README.md) - A library for writing and using C++ mock classes. [BSD]

* [Google Test](https://github.com/google/googletest) - Google C++ Testing Framework. [BSD]

* [Hippomocks](https://github.com/dascandy/hippomocks) - Single-header mocking framework. [LGPL-2.1]

* [IceCream-Cpp](https://github.com/renatoGarcia/icecream-cpp) - Never use cout/printf to debug again  [MIT]

* [ig-debugheap](https://github.com/deplinenoise/ig-debugheap) - Multiplatform debug heap useful for tracking down memory errors. [BSD]

* [libassert](https://github.com/jeremy-rifkin/libassert) - The most over-engineered C++ assertion library. [MIT]

* [libtap](https://github.com/zorgnax/libtap) - Write tests in C. [GPL2]

* [microprofile](https://github.com/jonasmr/microprofile) - Profiler with web-view for multiple platforms. [Unlicense]

* [MinUnit](https://github.com/siu/minunit) - A minimal unit testing framework for C self-contained in a single header file. [MIT]

* [nanobench](https://github.com/martinus/nanobench) - Simple, fast, accurate single-header microbenchmarking functionality for C++11/14/17/20. [MIT] [website](https://nanobench.ankerl.com)

* [Nanotimer](https://github.com/mattreecebentley/plf_nanotimer) - A simple low-overhead cross-platform timer class for benchmarking. [zLib] [website](http://www.plflib.org/nanotimer.htm)

* [Nonius](https://github.com/libnonius/nonius) - A C++ micro-benchmarking framework. [CC]

* [Remotery](https://github.com/Celtoys/Remotery) - Single C File Profiler with Web Viewer. [Apache2]

* [snitch](https://github.com/cschreib/snitch) - Lightweight C++20 testing framework. [Boost]

* [Touca](https://github.com/trytouca/trytouca) - Open-source regression testing system that you can self-host. [Apache2] [website](https://touca.io/)

* [UnitTest++](https://github.com/unittest-cpp/unittest-cpp) - A lightweight unit testing framework for C++. [MIT/X Consortium license]

* [Unity](https://github.com/ThrowTheSwitch/Unity) - Simple Unit Testing for C. [MIT]

* [utest.h](https://github.com/sheredom/utest.h) - Single header unit testing framework for C and C++. [Unlicense]

* [utl::profiler](https://github.com/DmitriBogdanov/UTL/blob/master/docs/module_profiler.md) - Singe-header profiler for C++17. [MIT]

* [μt](https://github.com/boost-experimental/ut) - C++20 single header/single module, macro-free μ(micro)/Unit Testing Framework. [Boost]

* [VLD](https://kinddragon.github.io/vld//) - Visual Leak Detector. A free, robust, open-source memory leak detection system for Visual C++.



## Documentation



* [Doxide](https://github.com/lawmurray/doxide) - Modern documentation for modern C++, configure with YAML, output Markdown. [Apache 2.0] [website](https://doxide.org)

* [doxygen](https://github.com/doxygen/doxygen) :zap: - The de facto standard tool for generating documentation from annotated C++ sources. [GPL2] [website](https://www.doxygen.org)

* [doxyrest](https://github.com/vovkos/doxyrest) - A compiler from Doxygen XML to reStructuredText for Sphinx. [MIT]

* [hdoc](https://github.com/hdoc/hdoc) - The modern documentation tool for C++. [AGPL/Proprietary] [website](https://hdoc.io)

* [Natural Docs](https://github.com/NaturalDocs/NaturalDocs) - Natural Docs is an open source documentation generator for multiple programming languages. [AGPL/Proprietary] [website](https://www.naturaldocs.org)

* [Sphinx](https://github.com/sphinx-doc/sphinx) - Sphinx makes it easy to create intelligent and beautiful documentation. [BSD-2-Clause] [website](https://www.sphinx-doc.org)



## DSP

*Digital signal processing.*



* [DSPFilters](https://github.com/vinniefalco/DSPFilters) - A collection of useful C++ classes for digital signal processing. [MIT]

* [FFTW](http://www.fftw.org/) - A C library for computing the DFT in one or more dimensions. [GPL]

* [iir1](https://github.com/berndporr/iir1) - IIR Realtime C++ filter library. [MIT]

* [kissfft](https://github.com/mborgerding/kissfft) - A Fast Fourier Transform (FFT) library that tries to Keep it Simple, Stupid. [BSD-3-Clause]

* [pocketfft](https://github.com/mreineck/pocketfft) - FFT implementation based on FFTPack, but with several improvements. [BSD-3-Clause]

* [wavelib](https://github.com/rafat/wavelib) - C implementation of 1D and 2D wavelet transforms. [BSD-3-Clause]



## Font

*Libraries for parsing and manipulating font files.*



* [Fontconfig](https://gitlab.freedesktop.org/fontconfig/fontconfig) - Font configuration and customization library. [MIT] [website](https://www.freedesktop.org/wiki/Software/fontconfig/)

* [FreeType](https://www.freetype.org/) - FreeType is a freely available software library to render fonts. [FTL & GPLv2]

* [otfcc](https://github.com/caryll/otfcc) - A C library and utility used for parsing and writing OpenType font files. [Apache-2.0]

* [harfbuzz](https://github.com/harfbuzz/harfbuzz) - A text shaping engine. [Old MIT]

* [libschrift](https://github.com/tomolt/libschrift) - A lightweight TrueType font rendering library. [ISC]



## Game Engine



* [Acid](https://github.com/Equilibrium-Games/Acid) - A high speed C++17 Vulkan game engine. [MIT]

* [Allegro](http://liballeg.org/) - A cross-platform library mainly aimed for video games and multimedia programming. [zlib]

* [Axmol Engine](https://github.com/axmolengine/axmol) - A cross-platform game engine for desktop, mobile, and XBOX (UWP), derived from Cocos2d-x-4.0. [MIT] [website](https://axmol.dev/)

* [Cocos2d-x](http://www.cocos2d-x.org/) - A multi-platform framework for building 2d games, interactive books, demos and other graphical applications. [MIT]

* [Corange](https://github.com/orangeduck/Corange) - A game engine written in pure C, SDL and OpenGL. [BSD]

* [crown](https://github.com/dbartolini/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]

* [delta3d](http://sourceforge.net/projects/delta3d/) - A robust simulation platform. [LGPL2]

* [EnTT](https://github.com/skypjack/entt) - Gaming meets modern C++. [MIT]

* [GamePlay](https://github.com/gameplay3d/GamePlay) - A cross-platform native C++ game framework for creating 2D/3D mobile and desktop games. [Apache2]

* [Godot](https://github.com/godotengine/godot) - A fully featured, open source, MIT licensed, game engine. [MIT]

* [Grit](https://github.com/grit-engine/grit-engine) - Community project to build a free game engine for implementing open world 3D games. [MIT]

* [Halley](https://github.com/amzeratul/halley) - A lightweight game engine written in C++14 with a "true" entity-component system. [Apache 2.0]

* [Hazel Game Engine](https://github.com/TheCherno/Hazel) - Hazel is primarily an early-stage interactive application and rendering engine for Windows. [Apache-2.0 license]

* [JNGL](https://github.com/jhasse/jngl/) - 2D library for Linux, Windows, macOS, Android, iOS, Xbox, the Nintendo Switch and the Web. [zlib] [website](https://bixense.com/jngl/)

* [KlayGE](https://github.com/gongminmin/KlayGE) - a cross-platform open source game engine with plugin-based architecture. [GPLv2] [website](http://www.klayge.org/)

* [nCine](https://github.com/nCine/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/)

* [o3de](https://github.com/o3de/o3de) - An open-source, real-time, multi-platform 3D engine based on Amazon Lumberyard. [Apache2] [website](https://o3de.org/)

* [OpenXRay](https://github.com/OpenXRay/xray-16) - a community-modified X-Ray engine used in S.T.A.L.K.E.R. game series. [Modified BSD/non-commercial only]

* [Oxygine](http://oxygine.org/) - A cross-platform 2D C++ game engine. [MIT]

* [Panda3D](https://github.com/panda3d/panda3d) - A game engine, a framework for 3D rendering and game development for Python and C++ programs. [Modified BSD] [website](https://www.panda3d.org/)

* [PixelGameEngine](https://github.com/OneLoneCoder/olcPixelGameEngine) - The official distribution of olcPixelGameEngine, a tool used in javidx9's YouTube videos and projects. [OLC3]

* [Polycode](https://github.com/ivansafrin/Polycode) - A cross-platform framework for creative code in C++ (with Lua bindings). [MIT] [website](http://polycode.org/)

* [quakeforge](https://github.com/quakeforge/quakeforge) - Actively maintained branch of the original Quake engine code with 20+ years of development. [GPL-2.0]

* [raylib](https://github.com/raysan5/raylib) - A simple and easy-to-use library to enjoy videogames programming. [zlib/libpng] [website](http://www.raylib.com/)

* [Spring](https://github.com/spring/spring) - A powerful free cross-platform RTS game engine. [GPLv2/GPLv3] [website](https://springrts.com/)

* [Torque2D](https://github.com/TorqueGameEngines/Torque2D) - An open-source and cross-platform C++ engine built for 2D game development. [MIT] [website](https://torque3d.org/torque2d)

* [Torque3D](https://github.com/TorqueGameEngines/Torque3D) - An open-source C++ engine built for 3D game development. [MIT] [website](https://torque3d.org/torque3d)

* [toy engine](https://github.com/hugoam/toy) - 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.

* [Urho3D](https://urho3d.github.io/) - A free lightweight, cross-platform 2D and 3D game engine implemented in C++. Greatly inspired by OGRE and Horde3D. [MIT]

* [ezEngine](https://github.com/ezEngine/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/)



## Graph



* [CXXGraph](https://github.com/ZigRazor/CXXGraph) - free C++(17) graph header-only library for representation and algorithms execution. [AGPL-3.0]

* [Graaf](https://github.com/bobluppes/graaf) - A general-purpose lightweight C++20 graph library. [MIT] [website](https://bobluppes.github.io/graaf/)



## GUI

*Graphic User Interface*



* [Boden](https://github.com/AshampooSystems/boden) - Native, mobile, cross-platform GUI Framework. [GPL/LGPL/Proprietary] [website](https://www.boden.io)

* [CEGUI](http://cegui.org.uk/) - Flexible, cross-platform GUI library.

* [Elements](https://github.com/cycfi/elements) - Lightweight, fine-grained, resolution independent, modular GUI library. [MIT]

* [FLTK](http://www.fltk.org/index.php) - Fast, light, cross-platform C++ GUI toolkit. [LGPL2]

* [FOX Toolkit](http://fox-toolkit.org) - an open-source, cross-platform widget toolkit. [LGPL]

* [GacUI](https://github.com/vczh-libraries/GacUI) - GPU Accelerated C++ User Interface, with WYSIWYG developing tools, XML supports, built-in data binding and MVVM features. [Ms-PL]

* [GTK+](http://www.gtk.org/) - A multi-platform toolkit for creating graphical user interfaces. [LGPL]

* [gtkmm](http://www.gtkmm.org/en/) - The official C++ interface for the popular GUI library GTK+. [LGPL]

* [imgui](https://github.com/ocornut/imgui) - Immediate Mode Graphical User Interface with minimal dependencies. [MIT]

* [implot](https://github.com/epezent/implot) - Immediate Mode Plotting widgets for imgui. [MIT]

* [iup](https://www.tecgraf.puc-rio.br/iup) - Multi-platform toolkit for building graphical user interfaces. [MIT]

* [libui](https://github.com/andlabs/libui) - Simple and portable (but not inflexible) GUI library in C that uses the native GUI technologies of each platform it supports. [MIT]

* [MyGUI](https://github.com/MyGUI/mygui) - Fast, flexible and simple GUI. [MIT]

* [nana](https://github.com/cnjinhao/nana) - Nana is a cross-platform library for GUI programming in modern C++ style. [Boost]

* [NanoGui](https://github.com/mitsuba-renderer/nanogui) - A minimalistic cross-platform widget library for OpenGL 3.x or higher. [BSD]

* [NAppGUI](https://github.com/frang75/nappgui_src) - SDK for building cross-platform desktop apps in ANSI-C. [MIT] [website](https://nappgui.com/en/home/web/home.html)

* [nuklear](https://github.com/Immediate-Mode-UI/Nuklear) - A single-header ANSI C gui library. [PublicDomain]

* [QCustomPlot](http://qcustomplot.com/) - Qt plotting widget without further dependencies. [GPLv3]

* [Qwt](http://qwt.sourceforge.net/) - Qt Widgets for Technical Applications. [Own based on LGPL]

* [QwtPlot3D](http://qwtplot3d.sourceforge.net/) - A feature-rich Qt/OpenGL-based C++ programming library, providing essentially a bunch of 3D-widgets. [zlib]

* [RmlUi](https://github.com/mikke89/RmlUi) - The HTML/CSS User Interface library evolved. Fork of libRocket. [MIT]

* [Saucer](https://github.com/saucer/saucer) - A modern, cross-platform C++ webview library. [MIT]

* [Sciter](http://sciter.com/) - Sciter is an embeddable HTML/CSS/scripting engine aimed to be used as an UI layer of modern desktop applications. [Free/Commercial]

* [Slint](https://github.com/slint-ui/slint) - Lightweight GUI toolkit for desktop and embedded. [GPL/Free/Proprietary] [website](https://slint.dev/)

* [TGUI](https://github.com/texus/TGUI) - Cross-platform modern c++ GUI. [Zlib] [website](https://tgui.eu/)

* [WebUI](https://github.com/webui-dev/webui) - Use any web browser as GUI, with your preferred language in the backend and HTML5 in the frontend. [MIT] [website](https://webui.me/)

* [wxCharts](https://github.com/wxIshiko/wxCharts) - A library to create charts in wxWidgets applications. [MIT] [website](https://www.wxishiko.com/wxCharts/)

* [wxWidgets](http://wxwidgets.org/) - A C++ library that lets developers create applications for Windows, Mac OS X, Linux and other platforms with a single code base. [Own LGPL]

* [Yue](https://github.com/yue/yue) - A library for creating native cross-platform GUI apps. [LGPLv2]



## Graphics



* [assimp](https://github.com/assimp/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)

* [bgfx](https://github.com/bkaradzic/bgfx) - A cross-platform rendering library. [BSD]

* [Blend2D](https://github.com/blend2d/blend2d) - 2D vector graphics engine powered by a JIT compiler. [Zlib] [website](https://blend2d.com/)

* [Cairo](http://www.cairographics.org/) - A 2D graphics library with support for multiple output devices. [LGPL2 or Mozilla MPL]

* [C-Turtle](https://github.com/walkerje/C-Turtle) - A C++11 header-only turtle graphics library acting as a CImg wrapper. [MIT]

* [Diligent Engine](https://github.com/DiligentGraphics/DiligentEngine) - A modern cross-platform low-level 3D graphics library. [Apache2]

* [DirectXTK](https://github.com/Microsoft/DirectXTK) - A collection of helper classes for writing DirectX 11.x code in C++. [MIT]

* [GLFW](https://github.com/glfw/glfw) - A simple, cross-platform OpenGL wrangling library. [zlib/libpng]

* [GLFWPP](https://github.com/janekb04/glfwpp) - A thin modern C++17 header-only wrapper for GLFW. [MIT]

* [Harfang 3D](https://github.com/harfang3d/harfang3d) 3D visualization library usable in C++, Python, Lua and Go. Based on BGFX. [GPLv3/LGPLv3/Proprietary] [website](https://www.harfang3d.com)

* [herebedragons](https://github.com/kosua20/herebedragons) - A basic 3D scene implemented with various engines, frameworks or APIs. [MIT] [website](http://simonrodriguez.fr/dragon/)

* [Horde3D](https://github.com/horde3d/Horde3D) - A small 3D rendering and animation engine. [EPL]

* [Ion](https://github.com/google/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/)

* [Irrlicht](http://irrlicht.sourceforge.net/) - A high performance realtime 3D engine written in C++. [zlib]

* [libigl](https://github.com/libigl/libigl) - Simple C++ geometry processing library. [MPL2]

* [LLGL](https://github.com/LukasBanana/LLGL) - Low Level Graphics Library (LLGL) is a thin abstraction layer for the modern graphics APIs. [BSD-3-Clause]

* [LunaSVG](https://github.com/sammycage/lunasvg) - a standalone SVG rendering library in C++. [MIT]

* [magnum](https://github.com/mosra/magnum) - Lightweight and modular C++11/C++14 graphics middleware for games and data visualization. [MIT] [website](http://magnum.graphics)

* [micro-gl](https://github.com/micro-gl/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)

* [NanoVG](https://github.com/memononen/nanovg) - Antialiased 2D vector drawing library on top of OpenGL for UI and visualizations. [Zlib]

* [Ogre 3D](https://github.com/OGRECave) :zap: - A scene-oriented, real-time, flexible 3D rendering engine (as opposed to a game engine) written in C++. [MIT] [website](https://www.ogre3d.org)

* [OpenSceneGraph](http://www.openscenegraph.org/) - An open source high performance 3D graphics toolkit. [OSGPL]

* [OpenSubdiv](https://github.com/PixarAnimationStudios/OpenSubdiv) - Pixar's library for evaluating and rendering subdivision surfaces on CPU and GPU. [Modified Apache2]

* [OpenVDB](http://www.openvdb.org/) - Library and tools for storing, editing, and rendering volumetric datasets. [MPL2]

* [Panda3D](http://www.panda3d.org/) - A framework for 3D rendering and game development for Python and C++. [BSD]

* [Partio](https://github.com/wdas/partio) - Library for wrangling particle data, with support for most common file formats. [Modified BSD]

* [Skia](https://github.com/google/skia) - A complete 2D graphic library for drawing Text, Geometries, and Images. [BSD] [website](https://skia.org/)

* [ThorVG](https://github.com/thorvg/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/)

* [TinySpline](https://github.com/msteinbeck/tinyspline) - A small, yet powerful ANSI C library for interpolating, transforming, and querying arbitrary NURBS, B-Splines, and Bézier curves. [MIT]

* [urho3d](https://github.com/urho3d/Urho3D) - Cross-platform rendering and game engine. [Many different, mostly MIT]

* [Yocto/GL](https://github.com/xelatihy/yocto-gl) - Tiny C++ Libraries for Data-Driven Physically-based Graphics. [MIT]

* [olive.c](https://github.com/tsoding/olive.c) - Simple 2D Graphics Library. [MIT]



## Image Processing



* [Boost.GIL](https://github.com/boostorg/gil) - Generic Image Library. [Boost] [website](https://boost.org/libs/gil)

* [BitmapPlusPLus](https://github.com/baderouaich/BitmapPlusPlus) - Simple and Fast header only Bitmap C++ library. [MIT]

* [CImg](http://cimg.eu/) - A small, open source, C++ toolkit for image processing. [Own LGPL or GPL]

* [CxImage](https://www.codeproject.com/Articles/1300/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]

* [Dlib](https://github.com/davisking/dlib) :zap: - A modern C++11 machine learning, computer vision, numerical optimization, and deep learning toolkit. [Boost] [website](http://dlib.net/)

* [fpng](https://github.com/richgel999/fpng) - Super fast C++ .PNG writer/reader. [Unlicense]

* [FreeImage](http://freeimage.sourceforge.net/) - An open source library that supports popular graphics image formats and others as needed by today's multimedia applications. [GPL2 or GPL3]

* [GD](https://github.com/libgd/libgd) - 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/)

* [DCMTK](http://dicom.offis.de/dcmtk.php.en) - DICOM Toolkit.

* [GDCM](http://gdcm.sourceforge.net/wiki/index.php/Main_Page) - Grassroots DICOM library.

* [ITK](http://www.itk.org/) - An open-source, cross-platform system for image analysis. [Apache2 from ITK 4.0]

* [Jpegli][https://github.com/google/jpegli] - an improved JPEG encoder and decoder implementation. [BSD-3-Clause]

* [Leptonica](https://github.com/DanBloomberg/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)

* [libavif](https://github.com/AOMediaCodec/libavif) - Library for encoding and decoding .avif files. [BSD-2-Clause]

* [libfacedetection](https://github.com/ShiqiYu/libfacedetection) - Open source library for face detection in images. The face detection speed can reach 1500FPS. [BSD]

* [libjpeg-turbo](https://github.com/libjpeg-turbo/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/)

* [libjxl](https://github.com/libjxl/libjxl) - JPEG XL image format reference implementation. [BSD-3-Clause]

* [libpng](https://github.com/pnggroup/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/)

* [libspng](https://github.com/randy408/libspng) - Simple, modern libpng alternative. [BSD-2] [website](https://libspng.org/)

* [libvips](https://github.com/jcupitt/libvips) - A fast image processing library with low memory needs. [LGPL] [website](http://www.vips.ecs.soton.ac.uk/)

* [LodePNG](https://github.com/lvandeve/lodepng) - PNG encoder and decoder in C and C++. [Zlib]

* [Magick++](https://imagemagick.org/script/magick++.php) - ImageMagick program interfaces for C++. [Apache2]

* [MagickWnd](https://imagemagick.org/script/magick-wand.php) - ImageMagick program interfaces for C. [Apache2]

* [MozJPEG](https://github.com/mozilla/mozjpeg) - Improved JPEG encoder. [BSD/BSD-3-Clause/ZLIB]

* [OpenCV](https://github.com/opencv) :zap: - Open source computer vision. [Apache2] [website](https://opencv.org)

* [OpenEXR](http://www.openexr.com/) - Cross-platform library for high dynamic range imaging. [Modified BSDF]

* [OpenImageIO](https://github.com/OpenImageIO/oiio) - Powerful image and texture wrangling library with support for a wide number of common lossy and RAW formats. [Modified BSD]

* [OpenJPEG](https://github.com/uclouvain/openjpeg) - an open-source JPEG 2000 codec written in C language.  [BSD-2-Clause]

* [PlutoFilter](https://github.com/sammycage/plutofilter) - A single-header, zero-allocation image filter library in C. [MIT]

* [QOI](https://github.com/phoboslab/qoi) - The “Quite OK Image Format” for fast, lossless image compression. [MIT]

* [SAIL](https://github.com/happy-sea-fox/sail) - Easy-to-use cross-platform image decoding library with pluggable image codecs. [MIT]

* [Simd](https://github.com/ermig1979/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]

* [stb-image](https://github.com/nothings/stb/blob/master/stb_image.h) - STB single-header image loading library. [Public Domain]

* [tesseract-ocr](https://github.com/tesseract-ocr) - An OCR engine. [Apache2]

* [TinyDNG](https://github.com/syoyo/tinydng) - Header-only Tiny DNG/TIFF loader and writer in C++. [MIT]

* [TinyEXIF](https://github.com/cdcseacave/TinyEXIF) - Tiny ISO-compliant C++ EXIF and XMP parsing library for JPEG. [MIT]

* [TinyTIFF](https://github.com/jkriege2/TinyTIFF) - lightweight TIFF reader/writer library. [GPL-3.0]

* [Video++](https://github.com/matt-42/vpp) - A C++14 high performance video and image processing library. [MIT]

* [VIGRA](https://github.com/ukoethe/vigra) - A generic C++ computer vision library for image analysis. [MIT X11]

* [VTK](http://www.vtk.org/) - Open-source, freely available software system for 3D computer graphics, image processing and visualization. [BSD]



## Internationalization



* [gettext](http://www.gnu.org/software/gettext/) - GNU 'gettext'. [GPL2]

* [IBM ICU](http://site.icu-project.org/) - A set of C/C++ and Java libraries providing Unicode and Globalization support. [ICU]

* [libiconv](http://www.gnu.org/software/libiconv/) - An encoding conversion library between different character encodings. [GPL]

* [simdutf](https://github.com/simdutf/simdutf) - Unicode routines (UTF8, UTF16, UTF32): billions of characters per second using SSE2, AVX2, NEON, AVX-512. [Apache-2/MIT]

* [uni-algo](https://github.com/uni-algo/uni-algo) - Unicode Algorithms Implementation for C/C++. [Unlicense or MIT]

* [utf8.h](https://github.com/sheredom/utf8.h) - Single header utf8 string functions for C and C++. [Unlicense]

* [utf8proc](https://github.com/JuliaStrings/utf8proc) - A clean C library for processing UTF-8 Unicode data. [MIT]



## Inter-process communication



* [Apache Thrift](https://thrift.apache.org/) - Efficient cross-language IPC/RPC, works between C++, Java, Python, PHP, C#, and many more other languages. Originally developed by Facebook. [Apache2]

* [Boost.Interprocess](https://github.com/boostorg/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)

* [bRPC](https://github.com/apache/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/)

* [Cap'n Proto](https://github.com/capnproto/capnproto) - Fast data interchange format and capability-based RPC system. [MIT] [website](https://capnproto.org/)

* [eCAL](https://github.com/continental/ecal) - Pub/sub, client/server, C++/Python/C#, various message protocols (protobuf, capnproto ..). [Apache2] [website](http://www.ecal.io/)

* [gRPC](https://github.com/grpc/grpc) - A high performance, open source, general-purpose RPC framework. [BSD] [website](http://www.grpc.io/)

* [Ice](https://github.com/zeroc-ice/ice) - Comprehensive RPC framework with support for C++, C#, Java, JavaScript, Python and more. [GPLv2]

* [iceoryx](https://github.com/eclipse-iceoryx/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/)

* [libjson-rpc-cpp](https://github.com/cinemast/libjson-rpc-cpp) - JSON-RPC framework for C++ servers and clients. [MIT]

* [nanomsg](https://github.com/nanomsg/nanomsg) - A simple high-performance implementation of several "scalability protocols". [MIT] [website](http://nanomsg.org/)

* [nng](https://github.com/nanomsg/nng) - nanomsg-next-generation, a light-weight brokerless messaging library. [MIT] [website](https://nanomsg.github.io/nng/)

* [rpclib](https://github.com/rpclib/rpclib) - A modern C++ msgpack-RPC server and client library. [MIT]

* [simple-rpc-cpp](https://github.com/pearu/simple-rpc-cpp) - A simple RPC wrapper generator to C/C++ functions. [BSD]

* [SRPC](https://github.com/sogou/srpc) - A lightweight RPC system that supports multiple protocols and OpenTelemetry. [Apache2]

* [WAMP](http://wamp.ws/) - Provides RPC and pub/sub messaging patterns. (various implementations, various languages)

* [xmlrpc-c](http://xmlrpc-c.sourceforge.net/) - A lightweight RPC library based on XML and HTTP. [BSD]



## JSON



* [Boost.PropertyTree](https://github.com/boostorg/property_tree) - A property tree parser/generator that can be used to parse XML/JSON/INI/Info files. [Boost] [website](https://boost.org/libs/property_tree)

* [cJSON](https://github.com/DaveGamble/cJSON) - Ultralightweight JSON parser in ANSI C. [MIT]

* [DAW JSON Link](https://github.com/beached/daw_json_link) - Fast, convenient JSON serialization and parsing in C++. [BSL-1.0]

* [frozen](https://github.com/cesanta/frozen) - JSON parser and generator for C/C++. [GPL & GPL2]

* [Glaze](https://github.com/stephenberry/glaze) - Extremely fast, in memory, JSON and interface library for modern C++. [MIT]

* [Jansson](https://github.com/akheron/jansson) - C library for encoding, decoding and manipulating JSON data. [MIT]

* [jbson](https://github.com/chrismanning/jbson) - jbson is a library for building & iterating BSON data, and JSON documents in C++14. [Boost]

* [JeayeSON](https://github.com/jeaye/jeayeson) - A very sane (header only) C++ JSON library. [BSD]

* [Jsmn](https://github.com/zserge/jsmn) - A minimalistic JSON parser in C. [MIT]

* [json](https://github.com/nlohmann/json) :zap: - JSON for Modern C++. [MIT] [website](https://json.nlohmann.me)

* [JSON++](https://github.com/hjiang/jsonxx) - A JSON parser in C++. [MIT]

* [json.cpp](https://github.com/jart/json.cpp) - a baroque JSON parsing / serialization library for C++. [Apache-2.0]

* [json.h](https://github.com/sheredom/json.h) - A simple one header/one source solution to parsing JSON in C and C++. [Unlicense]

* [json-build](https://github.com/lcsmuller/json-build) - C89 tiny zero-allocation JSON serializer. [MIT]

* [json-c](https://github.com/json-c/json-c) - A JSON implementation in C. [MIT]

* [jsoncons](https://github.com/danielaparker/jsoncons) - A C++ header-only library for JSON and JSON-like binary formats with JSONPointer, JSONPatch, JSONPath and JMESPath. [Boost]

* [JsonCpp](https://github.com/open-source-parsers/jsoncpp) - A C++ library for interacting with JSON. [MIT]

* [Jsonifier](https://github.com/RealTimeChris/Jsonifier) - A few classes for parsing and serializing objects from/into JSON - very rapidly. [MIT]

* [jsonParse](https://github.com/liufeigit/jsonParse) - A simple JSON parser in ANSI C. [MIT]

* [json-parser](https://github.com/udp/json-parser) - Very low footprint JSON parser written in portable ANSI C. [BSD]

* [json11](https://github.com/dropbox/json11) - A tiny JSON library for C++11. [MIT]

* [json-struct](https://github.com/jorgen/json_struct) - High performance, single header JSON parser parsing to and from C++ structs. [MIT]

* [json-voorhees](https://github.com/tgockel/json-voorhees) - JSON library for C++. Support for C++11. No dependencies, fast and dev-friendly. [Apache2]

* [JSON Toolkit](https://github.com/sourcemeta/jsontoolkit) - JSON, JSON Pointer, JSON Schema, and JSONL library for C++20. [AGPL/Commercial]

* [jute](https://github.com/amir-s/jute) - Very simple C++ JSON Parser. [PublicDomain]

* [libjson](https://github.com/vincenthz/libjson) - A JSON parser and printer library in C. easy to integrate with any model. [LGPL]

* [libjson](http://sourceforge.net/projects/libjson/) - Lightweight JSON library. [?]

* [LIBUCL](https://github.com/vstakhov/libucl) :zap: - Universal configuration library parser. [BSD-2-Clause]

* [meojson](https://github.com/MistEO/meojson) - Next-gen C++ JSON/JSON5 Serialization Engine | Zero Dependency | Header-Only | Unleash JSON Potential. [MIT]

* [parson](https://github.com/kgabis/parson) - Parson is a lighweight json library written in C. [MIT]

* [PicoJSON](https://github.com/kazuho/picojson) - A header-file-only, JSON parser serializer in C++. [BSD]

* [qt-json](https://github.com/gaudecker/qt-json) - A simple class for parsing JSON data into a QVariant hierarchy and vice versa. [GPLv3]

* [QJson](https://github.com/flavio/qjson) - A qt-based library that maps JSON data to QVariant objects. [LGPL2]

* [RapidJSON](https://github.com/miloyip/rapidjson) :zap: - A fast JSON parser/generator for C++ with both SAX/DOM style API. [MIT] [website](https://rapidjson.org)

* [sajson](https://github.com/chadaustin/sajson) - Lightweight, extremely high-performance JSON parser for C++11. [MIT]

* [simdjson](https://github.com/lemire/simdjson) - Extremely fast JSON library that can parse gigabytes of JSON per second. [Apache-2.0]

* [Sonic-Cpp](https://github.com/bytedance/sonic-cpp) - A fast JSON serializing & deserializing library, accelerated by SIMD. [Apache-2.0]

* [taoJSON](https://github.com/taocpp/json) - Zero-dependency C++ header-only JSON library. [MIT]

* [ujson](https://bitbucket.org/awangk/ujson) - µjson is a a small, C++11, UTF-8, JSON library. [MIT]

* [UltraJSON](https://github.com/ultrajson/ultrajson) - Ultra fast JSON decoder and encoder written in C. [BSD-3-Clause]

* [YAJL](https://github.com/lloyd/yajl) - A fast streaming JSON parsing library in C. [ISC]

* [yyjson](https://github.com/ibireme/yyjson) - A high performance JSON library written in ANSI C. [MIT]



## Logging



* [Abseil Logging](https://abseil.io/docs/cpp/guides/logging) - The Abseil Logging library provides facilities for writing log messages to stderr, files, or other sinks. [Apache-2.0]

* [Blackhole](https://github.com/3Hren/blackhole) - Attribute-based logging framework, which is designed to be fast, modular and highly customizable. [MIT]

* [Boost.Log](https://github.com/boostorg/log) - Designed to be very modular and extensible. [Boost] [website](https://boost.org/libs/log)

* [BqLog](https://github.com/Tencent/BqLog) -  A lightweight, high-performance logging system used in projects such as "Honor of Kings". [Apache-2.0]

* [Easylogging++](https://github.com/amrayn/easyloggingpp) - Extremely light-weight high performance logging library for C++11 (or higher) applications. [MIT]

* [fmtlog](https://github.com/MengRao/fmtlog) - A performant fmtlib-style logging library with latency in nanoseconds. [MIT]

* [G3log](https://github.com/KjellKod/g3log) - Asynchronous logger with Dynamic Sinks. [PublicDomain]

* [glog](https://github.com/google/glog) - C++ implementation of the Google logging module.

* [haclog](https://github.com/MuggleWei/haclog) - An extremely fast plain C logging library. [MIT]

* [Log4cpp](http://log4cpp.sourceforge.net/) - A library of C++ classes for flexible logging to files, syslog, IDSA and other destinations. [LGPL]

* [log4cplus](https://github.com/log4cplus/log4cplus) - A simple to use C++ logging API providing thread-safe, flexible, and arbitrarily granular control over log management and configuration. [BSD & Apache2]

* [loguru](https://github.com/emilk/loguru) - A lightweight C++ logging library. [PublicDomain]

* [lwlog](https://github.com/ChristianPanov/lwlog) - Very fast synchronous and asynchronous C++17 logging library. [MIT]

* [ng-log](https://github.com/ng-log/ng-log) - C++14 library for application-level logging. [BSD-3-Clause]

* [plog](https://github.com/SergiusTheBest/plog) - Portable and simple log for C++ in less than 1000 lines of code. [MPL2]

* [reckless](https://github.com/mattiasflodin/reckless) - Low-latency, high-throughput, asynchronous logging library for C++. [MIT]

* [spdlog](https://github.com/gabime/spdlog) - Super fast, header only, C++ logging library.

* [templog](http://www.templog.org/) - A very small and lightweight C++ library which you can use to add logging to your C++ applications. [Boost]

* [P7Baical](http://baical.net/p7.html) - An open source and cross-platform library for high-speed sending telemetry & trace data  with minimal usage of CPU and memory. [LGPL]

* [Quill](https://github.com/odygrd/quill) - Asynchronous cross platform low latency logging library. [MIT]



## Machine Learning



* [Caffe](https://github.com/BVLC/caffe) - A fast framework for neural networks. [BSD]

* [catboost](https://github.com/catboost/catboost) - A fast, scalable, high performance Gradient Boosting on Decision Trees library. [Apache2]

* [CCV](https://github.com/liuliu/ccv) - C-based/Cached/Core Computer Vision Library, A Modern Computer Vision Library. [BSD]

* [darknet](https://github.com/pjreddie/darknet) - Open source neural network framework written in C and CUDA. [PublicDomain] [website](https://pjreddie.com/darknet/)

* [Dlib](https://github.com/davisking/dlib) :zap: - A modern C++11 machine learning, computer vision, numerical optimization, and deep learning toolkit. [Boost] [website](http://dlib.net/)

* [FAISS](https://github.com/facebookresearch/faiss) - A library for efficient similarity search and clustering of dense vectors. [MIT]

* [Fido](https://github.com/FidoProject/Fido) - A highly-modular C++ machine learning library for embedded electronics and robotics. [MIT] [website](http://fidoproject.github.io/)

* [flashlight](https://github.com/facebookresearch/flashlight) - A fast, flexible machine learning library from Facebook AI Research written entirely in C++ and based on the ArrayFire tensor library. [BSD-3-Clause] [website](https://fl.readthedocs.io/en/latest/)

* [ggml](https://github.com/ggerganov/ggml) - Tensor library for machine learning with 16-bit and 4-bit quantization support. [MIT]

* [libsvm](https://github.com/cjlin1/libsvm) - A simple, easy-to-use, efficient library for Support Vector Machines. [BSD-3-Clause] [website](https://www.csie.ntu.edu.tw/~cjlin/libsvm/)

* [m2cgen](https://github.com/BayesWitnesses/m2cgen) - A CLI tool to transpile trained classic ML models into a native C code with zero dependencies. [MIT]

* [MeTA](https://github.com/meta-toolkit/meta) - A modern C++ data sciences toolkit. [MIT] [website](https://meta-toolkit.org/)

* [Minerva](https://github.com/dmlc/minerva) - A fast and flexible system for deep learning. [Apache2]

* [mlpack](https://github.com/mlpack/mlpack) - A scalable c++ machine learning library. [LGPLv3] [website](http://www.mlpack.org/)

* [ncnn](https://github.com/Tencent/ncnn) - A high-performance neural network inference computing framework optimized for mobile platforms. [BSD]

* [OpenCV](https://github.com/Itseez/opencv) :zap: - Open Source Computer Vision Library. [BSD] [website](http://opencv.org/)

* [oneDAL](https://github.com/oneapi-src/oneDAL) - A powerful machine learning library that helps speed up big data analysis. [Apache]

* [ONNX runtime](https://github.com/microsoft/onnxruntime) - 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/)

* [Recommender](https://github.com/GHamrouni/Recommender) - C library for product recommendations/suggestions using collaborative filtering (CF). [BSD]

* [RNNLIB](https://github.com/szcom/rnnlib) - RNNLIB is a recurrent neural network library for sequence learning problems. [GPLv3]

* [SHOGUN](https://github.com/shogun-toolbox/shogun) - The Shogun Machine Learning Toolbox. [GPLv3]

* [sofia-ml](https://code.google.com/p/sofia-ml/) - The suite of fast incremental algorithms for machine learning. [Apache2]

* [USearch](https://github.com/unum-cloud/usearch) - Fast search and clustering library for vectors and strings. [Apache2]

* [VLFeat](https://github.com/vlfeat/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/)

* [xgboost](https://github.com/dmlc/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]



## Math



* [Apophenia](https://github.com/b-k/apophenia) - A C library for statistical and scientific computing. [GPL2]

* [Armadillo](https://gitlab.com/conradsnicta/armadillo-code) - Fast C++ library for linear algebra & scientific computing. [Apache2] [website](http://arma.sourceforge.net/)

* [autodiff](https://github.com/autodiff/autodiff) - A modern, fast and expressive C++ library for automatic differentiation. [MIT] [website](https://autodiff.github.io)

* [blaze](https://bitbucket.org/blaze-lib/blaze) - high-performance C++ math library for dense and sparse arithmetic. [BSD]

* [Boost.Multiprecision](https://github.com/boostorg/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)

* [ceres-solver](http://ceres-solver.org/) - C++ library for modeling and solving large complicated nonlinear least squares problems from google. [BSD]

* [CGAL](https://github.com/CGAL/cgal) - Collection of efficient and reliable geometric algorithms. [LGPL&GPL] [website](http://www.cgal.org/)

* [cml](https://github.com/demianmnave/CML) - The configurable math library. [Boost]

* [CNL](https://github.com/johnmcfarlane/cnl/) - A Compositional Numeric Library for C++. [Boost]

* [DirectXMath](https://github.com/microsoft/DirectXMath) - An all inline SIMD C++ linear algebra library for use in games and graphics apps.

* [Dlib](https://github.com/davisking/dlib) :zap: - A modern C++11 machine learning, computer vision, numerical optimization, and deep learning toolkit. [Boost] [website](http://dlib.net/)

* [Eigen](http://eigen.tuxfamily.org/) - A high-level C++ library of template headers for linear algebra, matrix and vector operations, numerical solvers and related algorithms. [MPL2]

* [ExprTk](https://www.partow.net/programming/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](https://www.geometrictools.com) - C++ library for computing in the fields of mathematics, graphics, image analysis and physics. [Boost] [website](https://www.geometrictools.com)

* [GLM](https://github.com/g-truc/glm) - Header-only C++ math library that matches and inter-operates with OpenGL's GLSL math. [MIT] [website](https://glm.g-truc.net/)

* [GMTL](http://ggt.sourceforge.net/) - Graphics Math Template Library is a collection of tools implementing Graphics primitives in generalized ways. [GPL2]

* [GMP](https://gmplib.org/) - A C library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating-point numbers. [LGPL3 & GPL2]

* [Klein](https://github.com/jeremyong/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)

* [libfixmath](https://github.com/PetteriAimonen/libfixmath) - Cross Platform Fixed Point Maths Library. [MIT]

* [linalg.h](https://github.com/sgorsten/linalg) - Single header, public domain, short vector math library for C++. [Unlicense]

* [MATIO](https://github.com/tbeu/matio) -  MATLAB MAT File I/O Library. [BSD-2-Clause] [website](https://sourceforge.net/projects/matio/)

* [MatX](https://github.com/NVIDIA/MatX) - A GPU-accelerated C++17 numerical computing library with a MATLAB/Python-like syntax. [BSD 3-clause]

* [mexce](https://github.com/imakris/mexce) - A single-header, dependency-free JIT compiler for scalar mathematical expressions that generates optimized x87 FPU machine code. [BSD]

* [MIRACL](https://github.com/CertiVox/MIRACL) - A Multiprecision Integer and Rational Arithmetic Cryptographic Library. [AGPL]

* [NumCpp](https://github.com/dpilger26/NumCpp) - A templatized header only C++ implementation of the Python Numpy library. [MIT]

* [OMath](https://github.com/orange-cpp/omath) - Cross-platform modern general purpose math library written in C++23 that suitable for cheat/game development. [ZLIB]

* [muparser](https://beltoforion.de/en/muparser) - muParser is an extensible high performance math expression parser library written in C++. [MIT]

* [LibTomMath](https://github.com/libtom/libtommath) - A free open source portable number theoretic multiple-precision integer library written entirely in C. [PublicDomain & WTFPL] [website](http://www.libtom.net/)

* [linmath.h](https://github.com/datenwolf/linmath.h) - A lean linear math library, aimed at graphics programming. [WTFPL]

* [lp_solve](https://sourceforge.net/projects/lpsolve) - A library used to formulate and solve linear programming problems. [LGPL] [website](http://lpsolve.sourceforge.net)

* [OpenBLAS](https://github.com/xianyi/OpenBLAS) - An optimized BLAS library based on GotoBLAS2 1.13 BSD version. [BSD 3-clause] [website](http://www.openblas.net/)

* [PCG-rand](https://www.pcg-random.org/) - 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]

* [QuantLib](https://github.com/lballabio/quantlib) - A free/open-source library for quantitative finance. [Modified BSD] [website](http://quantlib.org/)

* [sebsjames/maths](https://github.com/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/)

* [SimSIMD](https://github.com/ashvardanian/SimSIMD) - Vector distance functions for x86 AVX2, AVX-512, Arm NEON, and SVE. [Apache2]

* [StatsLib](https://github.com/kthohr/stats) - A C++ header-only library of statistical distribution functions. [Apache2] [website](https://www.kthohr.com/statslib.html)

* [SymEngine](https://github.com/symengine/symengine) - Fast symbolic manipulation library, a rewriting of SymPy's core in C++. [MIT]

* [TinyExpr](https://github.com/codeplea/tinyexpr) - A C library for parsing and evaluating math expressions from strings. [zlib]

* [Vc](https://github.com/VcDevel/Vc) - SIMD Vector Classes for C++. [BSD]

* [Versor](http://versor.mat.ucsb.edu/) - A (fast) Generic C++ library for Geometric Algebras, including Euclidean, Projective, Conformal, Spacetime (etc).

* [Wagyu](https://github.com/mapbox/wagyu) - A general library for geometry operations of union, intersections, difference, and xor. [mapbox-wagyu original]

* [Wykobi](https://www.wykobi.com) - A C++ library of efficient, robust and simple to use C++ 2D/3D oriented computational geometry routines. [MIT]

* [xtensor](https://github.com/xtensor-stack/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)

* [universal](https://github.com/stillwater-sc/universal) - A C++14 header-only library implementing arbitrary posit arithmetic.