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awesome-dotnet

https://github.com/arielmontana/awesome-dotnet

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Application Frameworks
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- .NET Boxed Framework - .NET Core Extensions and Helper NuGet packages
- ASP.NET Boilerplate - A starting point for new modern ASP.NET MVC web applications with best practices and most popular tools.
- ABP - The next generation of the ASP.NET Boilerplate web application framework.
- Orleans - Orleans is a framework that provides a straight-forward approach to building distributed high-scale computing applications, without the need to learn and apply complex concurrency or other scaling patterns
- CoreFX - The corefx repo contains the library implementation (called "CoreFX") for .NET Core. It includes System.Collections, System.IO, System.Xml and many other components.
- CSLA .NET - business layer development framework https://cslanet.com/
- Mono - Open source ECMA CLI, C#, F#, VB and .NET implementation
- Mono-Addins - Mono.Addins is a generic framework for creating extensible applications, and for creating add-ins which extend those applications
- peasy - Peasy is a middle tier framework that offers an easy to use and flexible rules engine and was designed to address common challenges such as concurrency handling, transactional support, fault tolerance, threading, scalability, async and multiple client support, and easy testability, all without a huge learning curve!
- Spring.Net - Spring.NET is an open source application framework that makes building enterprise .NET applications easier
- DotNetty - DotNetty is a port of Netty, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.
- AspectCore Framework - AspectCore Framework is an Aspect-Oriented Programming based cross platform framework for .NET Core and .NET Framework. Core support for aspect-interceptor,dependency injection integration , web applications , data validation , and more.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Ether.Network - Ether.Network is an open source networking library that allow developers to create simple, fast and scalable socket server or client applications over the TCP/IP protocol.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
- Butterfly Server .NET - Enables defining a Web API and Subscription API that automatically synchronizes datasets across connected clients. Allows building real-time web apps and native apps with minimal effort.
HTML and CSS
- FluentBootstrap - Makes the Bootstrap CSS framework easier to use from ASP.NET MVC or WebPages.
- HtmlAgilityPack - an agile HTML parser that builds a read/write DOM and supports plain XPath or XSLT
PDF
- Pdfium.Net SDK - Advanced C# PDF library for render, create, edit, merge, split, print, and view PDFs. Open source PDF Viewer is available on [GitHub](https://github.com/patagames). A [NuGet package](https://www.nuget.org/packages/Pdfium.Net.SDK/) is also available for easy inclusion into your projects.**[$]**
- Pdfium.Net SDK - Advanced C# PDF library for render, create, edit, merge, split, print, and view PDFs. Open source PDF Viewer is available on [GitHub](https://github.com/patagames). A [NuGet package](https://www.nuget.org/packages/Pdfium.Net.SDK/) is also available for easy inclusion into your projects.**[$]**
Algorithms and Data structures
- Algorithmia - Algorithm and data-structure library for .NET 3.5 and up. Algorithmia contains sophisticated algorithms and data-structures like graphs, priority queues, command, undo-redo and more.
- C# Algorithms - A C# plug-and-play class-library project of standard Data Structures and Algorithms. It contains 35+ Data Structures and 30+ Algorithms designed as Object-Oriented isolated components.
API
- Telegram.Bot - .NET Client for [Telegram Bot API](https://core.telegram.org/bots/api)
- NancyFx - Lightweight, low-ceremony, framework for building HTTP-based services on .NET and Mono
- Mobius: C# API for Spark - Mobius adds C# language binding to Apache Spark, enabling the implementation of Spark driver code and data processing operations in C#.
- ServiceStack - Thoughtfully architected, obscenely fast, thoroughly enjoyable web services for all
- Nelibur - Nelibur is message based web service framework on the pure WCF. Nelibur simplifies creating high-performance and message-based web services and you certainly have all the power of the WCF.
- WebAPI Contrib - Collection of open source projects to help improve your work with ASP.NET Web API
- Breeze - API framework enabling rich data access by using the OData 3 protocol. Client libraries available for JavaScript and C#.
- Xamarin.Essentials - Xamarin.Essentials provides developers with cross-platform APIs for their mobile applications.
- Xamarin.Essentials - Xamarin.Essentials provides developers with cross-platform APIs for their mobile applications.
Application Templates
- .NET Boxed Templates - .NET project templates with batteries included, providing the minimum amount of code required to get you going faster.
- ASP.NET Core Starter Kit - backend: .NET Core, EF Core, C#; frontend: Babel, Webpack, React, CSS Modules
- ProjectScaffold - A prototypical .NET solution recommended by the F# Foundation---includes file system setup, Paket for dependencies and FAKE for build/test automation. By default, build process also compiles documentation and generates NuGet packages.
- Serene - Serenity is an ASP.NET MVC application platform designed to simplify and shorten development of data-centric business applications with a service-based architecture. Serene is a starter template to build Serenity applications.
- Side-Waffle - Large collection of useful templates for Web and Desktop development.
- Template10 - Windows 10 templates with design patterns.
- MVC.Template - ASP.NET Core MVC project starter template.
Assembly Manipulation
- Fody - Extensible tool for weaving .NET assemblies.
- ILRepack - Open-source alternative to ILMerge.
- Mono.Cecil - Cecil is a library to generate and inspect programs and libraries in the ECMA CIL form.
Assets
- Cassette - Manages .NET web application assets (scripts, css and templates)
- NodeAssets - Asset Manager for .NET that has live CSS updates using SignalR and can optionally leverage Node.js compilers
- Bundle Transformer - Modular extension for [Microsoft ASP.NET Web Optimization Framework](https://www.nuget.org/packages/Microsoft.AspNet.Web.Optimization). Its modules supports LESS, Sass, CoffeeScript, TypeScript, Mustache, Handlebars, Autoprefixer along with a bunch of different JS and CSS minifiers.
- Bundler - Compile & Minify Less/Sass/Stylus/Css/JS/CoffeeScript/LiveScript files. Integrates with MVC and ServiceStack
- SquishIt - Lets you *easily* bundle some CSS and JavaScript
Authentication and Authorization
- ASP.NET Identity - New membership system for ASP.NET applications
- DotNetOpenAuth - A C# implementation of the OpenID, OAuth and InfoCard protocols
- Logibit Hawk - A F# [Hawk](https://github.com/hueniverse/hawk#usage-example) authentication library
- IdentityModel - Helper library for identity & access control in .NET 4.5 and MVC4/Web API.
- IdentityServer - Extensible OAuth2 and OpenID Connect provider framework.
- OAuth - A very lightweight library for generating OAuth 1.0a signatures written in C#
- Stuntman - Stuntman is a library for impersonating users during development leveraging .NET Claims Identity.
Build Automation
- Psake - .NET-based build automation tool written in PowerShell
- FAKE - F# Make, a cross-platform build automation system
- Invoke-Build - PowerShell build and test automation tool inspired by Psake.
- MSBuild - The Microsoft Build Engine (MSBuild) is the build platform for .NET and Visual Studio
- Cake - Cake (C# Make) is a cross-platform build automation system with a C# DSL.
- Nake - Magic script-based C# task runner
- Nuke - Cross-platform build automation system
- FlubuCore - A cross platform build and deployment automation system for building projects and executing deployment scripts using C# code.
Business Intelligence
- FastReport - The open source report generator for .NET Core 2.x/.Net Framework 4.x. FastReport can be used in ASP.NET MVC, Web API applications.
- NReco PivotData - in-memory data aggregation/OLAP library, pivot tables generation (render to HTML, exports), ASP.NET pivot builder control **[$][Free for single-deployment/non-SaaS]**
Caching
- CacheCow - An ASP.NET Web API HTTP caching implementation both on client and server
- Akavache - An asynchronous, persistent key-value store
- CacheManager - A common interface and abstraction layer for caching.
- Foundatio - A common interface with in memory, Redis and hybrid implementations.
- Cashew - a .NET library for caching responses easily with an `HttpClient` through an API that is simple and elegant yet powerful.
- CacheAdapter - Another common cache abstraction layer for caching with enhanced cache API usage.
CLI
- Argu - Declarative CLI argument & XML configuration parser for F# applications.
- clipr - A CLI library inspired by Python's argparse that transforms a command line into a strongly-typed object. It supports custom argument types, automated (and localized) help generation, and a variety of ways to store parsed arguments.
- CliWrap - Wrapper for command line interfaces.
- Colorful.Console - Colorful console output.
- Command Line Parser - The Command Line Parser Library offers to CLR applications a clean and concise API for manipulating command-line arguments and related tasks
- CsConsoleFormat - .NET C# library for advanced formatting of console output.
- Docopt - Command-line interface description language that will make you smile.
- EntryPoint - Composable CLI Argument Parser for .NET Core & .NET Framework 4.5+.
- Fluent Command Line Parser - A simple, strongly typed .NET C# command-line parser library using a fluent easy to use interface
- Power Args - PowerArgs converts command-line arguments into .NET objects that are easy to program against. It also provides a ton of optional capabilities such as argument validation, auto generated usage, tab completion, and plenty of extensibility
- ReadLine - A GNU-Readline like library for .NET/.NET Core.
- SharpNetSH - A simple netsh library for C#.
- Gui.cs - Terminal UI toolkit for .NET.
- Appccelerate - Command Line Parser - A command-line parser with fluent definition syntax, different argument types, required and optional arguments, value restrictions, aliases, type conversion and semi-automatic usage help message composition
CLR
- CoreCLR - The coreclr repo contains the complete runtime implementation (called "CoreCLR") for .NET Core. It includes RyuJIT, the .NET GC, native interop and many other components.
CMS
- Composite C1 - A web CMS that focus on UX and adaptability
- mojoPortal - MojoPortal is an extensible, cross database, mobile friendly, web content management system (CMS) and web application framework written in C# ASP.NET
- N2CMS - Open source, lightweight, code-first CMS able to seamlessly integrate into any MVC project.
- Orchard - Free, open source, community-focused project aimed at delivering applications and reusable components on the ASP.NET platform
- Umbraco - Umbraco is a free open source Content Management System built on the ASP.NET platform
- BlogEngine.NET - Simple but full featured ASP.NET blog
- Piranha CMS - Piranha is the fun, fast and lightweight .NET framework for developing cms-based web applications with an extra bite. It's built on ASP.NET MVC and Web Pages and is fully compatible with both Visual Studio and WebMatrix. http://piranhacms.org
- BetterCMS - Open Source .NET Intuitive User Interface for Developer and Publisher
- DotNetNuke - DNN Platform is our free, open source web CMS and the foundation of every professional DNN solution. Over 750,000 organizations worldwide have built websites powered by the DNN Platform.
Code Analysis and Metrics
- .NET Compiler Platform ("Roslyn") Analyzers - A number of Roslyn diagnostic analyzers initially developed to help flesh out the design and implementation of the static analysis APIs.
- App.Metrics - App Metrics is an open-source and cross-platform .NET library used to record and report metrics within an application and reports it's health. See the [docs](https://www.app-metrics.io/) for me details.
- Gendarme - Extensible rule-based tool to find problems in .NET applications and libraries
- Metrics-Net - Capturing CLR and application-level metrics. So you know what's going on.
- AspNet.Metrics - Capturing CLR, application-level web request metrics. Middleware and extensions using Metrics-Net
- BenchmarkDotNet - Powerful .NET library for benchmarking.
- NsDepCop - Static code analysis tool to enforce namespace dependency rules in C# projects.
- StyleCop - StyleCop analyzes C# source code to enforce a set of style and consistency rules
- Codinion - Enhanced syntax highlighting for C# and some other "Visual" features. **[$]**
Compilers, Transpilers and Languages
- ClojureCLR - A port of Clojure to the CLR, part of the Clojure project
- JSIL - CIL to JavaScript Compiler http://jsil.org/
- Mond - A dynamically typed scripting language written in C# with a REPL, debugger, and simple embedding API.
- Mono-basic - Visual Basic Compiler and Runtime
- Nemerle - Nemerle is a high-level statically-typed programming language for the .NET platform. It offers functional, object-oriented and imperative features. It has a simple C#-like syntax and a powerful meta-programming system.
- Netjs - .NET to TypeScript and JavaScript compiler. Portable Class Libraries work great for this. You can even pass EXEs.
- P - P is a language for asynchronous event-driven programming.
- PeachPie - PeachPie is a PHP compiler and runtime for .NET and .NET Core, which allows entire PHP applications to run on the modern, secure and performant .NET and .NET Core platforms.
- Roslyn - The .NET Compiler Platform ("Roslyn") provides open-source C# and Visual Basic compilers with rich code analysis APIs. It enables building code analysis tools with the same APIs that are used by Visual Studio.
- Testura.Code - Wrapper around the Roslyn API and used for generation, saving and compiling C# code. It provides methods and helpers to generate classes, methods, statements and expressions.
- VisualFSharp - The Visual F# compiler and tools
- Fable - F# to JavaScript Compiler
- LinqOptimizer - An automatic query optimizer-compiler for Sequential and Parallel LINQ
- Roslyn-linq-rewrite - Compiles C# code by first rewriting the syntax trees of LINQ expressions using plain procedural code, minimizing allocations and dynamic dispatch.
- Iron python - A python 2 implementation that is integrated with the dot net framework.
- F# - The F# compiler, core library and tools - a functional programming language for safer, faster, better code writing.
- IronScheme - R6RS Scheme compiler, runtime and many standard libraries
- Bridge.NET - Open Source C# to JavaScript Compiler https://bridge.net/
- FunScript - F# to JavaScript compiler with jQuery etc. mappings through a TypeScript type provider.
- Hybridizer - CIL (C#, VB.Net, F#) to CUDA compiler. **[$]**
Compression
- SharpCompress - SharpCompress is a compression library for .NET/Mono/Silverlight/WP7 that can unrar, un7zip, unzip, untar unbzip2 and ungzip with forward-only reading and file random access APIs. Write support for zip/tar/bzip2/gzip are implemented
- DotNetZip.Semverd - An open-source project that delivers a .NET library for handling ZIP files, and some associated tools. (fork of [**Unmaintained** DotNetZip](https://archive.codeplex.com/?p=dotnetzip))
- Snappy for Windows - Snappy compression library for .NET baked on P/Invoke
Artificial Intelligence
- SIML - Synthetic Intelligence Markup Language, a next generation Chatbot & Digital Assistant Language.
Books
- .NET Core in Action - teaches how to write applications and libraries with .NET Core. **[$]**
- 3rd edition - sharp-in-depth-fourth-edition) - deep dive into the details of the C# language. **[$]**
- CLR via C# - Dig deep and master the intricacies of the common language runtime, C#, and .NET development. **[$]**
- Functional Programming in C# - teaches how to best leverage the functional features of the C# language. **[$]**
- Microservices in .NET Core - shows you how to build maintainable, secure and operations-friendly microservices using Nancy and .NET Core. **[$]**
- Dependency Injection in .NET - injection-principles-practices-patterns) - teaches you to use Dependency Injection to reduce hard-coded dependencies between application components in .NET. **[$]**
- ASP.NET Core in Action - teaches how to write web applications with ASP.NET Core. **[$]**
- Entity Framework Core in Action - teaches how to use Entity Framework Core, including lighter weight data access alternatives such as Dapper. **[$]**
- The Little ASP.NET Core Book - A free, open-source, tutorial-based book aiming to provide a simple introduction to ASP.NET Core.
Code Snippets
- .NET Fiddle - Write, compile and run C#, F# and VB code in the browser. The .Net equivalent of JSFiddle.
- Gistlyn - Create, run and share your executable C# GitHub Gists.
- TryRoslyn - Run C# code using different branches and versions of Roslyn.
Package Management
- MyGet - Hosted Package Repository for NuGet, NPM, Bower and VSIX. Also provides CI as-a-Service. **[$]**
- NuGet - The .NET package manager
Continuous Integration
- AppVeyor - .NET Continuous Integration and Deployment as a service. **[$]** **[Free for OSS]**
Cryptography
- libsodium-net - libsodium for .NET - A secure cryptographic library
Database Drivers
- MySQL Connector - Connector/Net is a fully-managed ADO.NET driver for MySQL
- Firebird.NET - The .NET Data provider is written in C# and provides a high-performance, native implementation of the Firebird API
Decompilation
- ILSpy - ILSpy is the open-source .NET assembly browser and decompiler
- JustDecompile Engine - The decompilation engine of [JustDecompile](https://www.telerik.com/products/decompiler.aspx)
- dotPeek - Free-of-charge standalone tool based on ReSharper's bundled decompiler. It can reliably decompile any .NET assembly into equivalent C# or IL code. It can create Visual Studio solutions based on the original binary files in a straight-forward way. **[Proprietary]** **[Free]**
DirectX
- SlimDX - DirectX framework wrapper for .NET applications
- SlimDX - DirectX framework wrapper for .NET applications
- SlimDX - DirectX framework wrapper for .NET applications
Distributed Computing
- MBrace - Integrated Data Scripting for the Cloud
E-Commerce and Payments
- Paypal Merchant SDK - Official PayPal Merchant SDK for .NET
Event aggregator and messenger
- Rx Event Aggregator - Super-simple Reactive-Extension code from Reactive.EventAggregator
Game
- Wave Engine - Wave engine is a free C# component-based modern game engine which allows you to create cross-platform games supporting Kinect, Oculus Rift, Vuforia, Cardboard, Leap Motion and much more. **[Free][Proprietary]**
GIS
- SharpMap - to-use mapping library for use in web and desktop applications
- OsmSharp - C# library to work with OpenStreetMap (OSM) data. Provides reading, writing and route-planning for OSM data.
- NetTopologySuite
GUI
- DockPanelSuite - The Visual Studio inspired docking library for .NET WinForms
- MaterialDesignInXamlToolkit - Toolkit for creating Material Design styled WPF apps
HTTP
- Flurl - Fluent, portable, testable REST/HTTP client library
IDE
- Visual Studio Express - The free lightweight version of Visual Studio for .NET programming.
- Visual Studio Community - A full-featured IDE
- Visual Studio Code - Excellent open source editor from Microsoft, based on Electron.
- Rider - A cross-platform C# IDE based on the IntelliJ platform and ReSharper
Image Processing
- ImageResizer - Add commands to image URLs to get altered versions in milliseconds. Resizing, editing etc of images in real-time.
- DynamicImage - High-performance open-source image manipulation library for ASP.NET.
- Emgu CV - Cross-platform .NET wrapper for the OpenCV library.
Install tools
- Wax - An interactive editor for WiX projects.
IoC
- StructureMap - The original IoC/DI Container for .Net
Logging
- ELMAH - Official ELMAH site
- Log4Net - The Apache log4net library is a tool to help the programmer output log statements to a variety of output targets
- BugSnag - Logs errors. Includes useful diagnostic info like stack trace, session, release, etc. Has a free tier. **[Free for OSS][$]**
Machine Learning and Data Science
- Accord.NET - Machine learning framework combined with audio and image processing libraries (computer vision, computer audition, signal processing and statistics).
- FsLab - A collection of data science and machine learning libraries for F# and .NET
Markdown Processors
- MarkdownSharp - Open source C# implementation of Markdown processor, as featured on Stack Overflow.
Mathematics
- MathNet - Math.NET is an open source initiative to build and maintain toolkits covering fundamental mathematics, targetting advanced but also every day needs of .NET developers
Misc
- CSharp Pad - A web-based C# REPL with awesome code completion.
- CSScript - CS-Script is a CLR based scripting system which uses C# as a programming language. CS-Script currently targets Microsoft implementation of CLR (.NET 2.0/3.0/3.5/4.0/4.5) with full support on Mono. Comes with many additional features, such as script hosting.
- LINQPad - a C#/VB/F# scratchpad that instantly executes any expression, statement block or program with rich output formatting and a wealth of features. Also lets you interactively query databases in LINQ. [$]
MVVM
- Catel - Catel is an application development platform with the focus on MVVM (WPF, Silverlight, Windows Phone and WinRT) and MVC (ASP.NET MVC). The core of Catel contains an IoC container, models, validation, memento, message mediator, argument checking, etc.
- UpdateControls - Update Controls does not require that you implement `INotifyPropertyChanged` or declare a `DependencyProperty`. It connects controls directly to CLR properties. This makes it perfect for the Model/View/ViewModel pattern.
ORM
- NHibernate - NHibernate Object Relational Mapper
Protocols
- SharpSnmpLib - An open source SNMP implementation for .NET/Mono/Xamarin. Versioin 1, 2c, and 3 are supported.
Scheduling
- Hangfire - An easy way to perform fire-and-forget, delayed and recurring tasks inside .NET apps
State machines
- Appccelerate - State Machine - A powerful state machine library - configured with a fluent API and synchrounous and asynchronous state transition support
Static Site Generators
- Wyam - A simple to use, highly modular, and extremely configurable static content generator
Style Guide
- C# Style Guide - StackOverflow Q & A on style guides
- C# Coding Conventions - Official MSDN C# code conventions
Testing
- NCrunch - An automated continuous & concurrent testing tool for Visual Studio. **[$]**
Tools
- Fiddler - The free web debugging proxy for any browser, system or platform
Visual Studio Plugins
- Nuget Package Manager - NuGet is the package manager for the Microsoft development platform including .NET
- Refactoring Essentials - Open source extension for C# and VB.NET refactorings, including code best practice analyzers.
- Productivity Power Tools - A set of extensions to Visual Studio Professional (and above) which improves developer productivity.
- VSColorOutput - Color highlighting for Build, Find and Debug output windows. Custom match patterns and colors can be added.
- Developer Assistant - Developer Assistant for Visual Studio enables developers to find and reuse over 21 million code snippets and code sample projects from within the Visual Studio IDE.
- CodeLineage - Easy access to a cumulative diff view between file revisions (supports svn, git, mercurial, perforce).
- OzCode - OzCode is a Visual Studio Extension which cuts down on debugging time and increases productivity by detecting and isolating bugs, making them easy to fix. **[$]**
Web Frameworks
- Coalesce - Coalesce is a framework for rapid-development of ASP.NET Core web applications.
- Suave.IO - Framework/library/web server that makes you cry tears of joy after finishing your project ahead-of-time when you look at the beautiful code you've written in F#.
WebSocket
- Crossertech - Provides a great set of tools for you to build real-time applications on the Microsoft.NET plattform and much more. **[$]**
WPF
- Awesome .NET Core - A collection of awesome .NET core libraries, tools, frameworks and software
- awesome-ddd - A curated list of Domain-Driven Design (DDD), Command Query Responsibility Segregation (CQRS), Event Sourcing, and Event Storming resources
- Awesome Unity - A categorized community-driven collection of high-quality awesome Unity assets, projects, and resources.
- Awesome Xamarin - A collection of interesting libraries/tools for Xamarin mobile projects.
- Awesome Roslyn - A curated list of awesome Roslyn books, tutorials, open source projects, analyzers, code fixes, and refactorings.
- Weekly C# Digest - Weekly email newsletter with manually curated top 5 links from the .NET community.
Serialization
- F# Data - F# type providers for accessing XML, JSON, CSV and HTML files (based on sample documents) and for accessing WorldBank data
Graphics
- Helix Toolkit - Helix Toolkit is a collection of 3D components for .NET

Programming Languages

C# 75 F# 6 JavaScript 4 PowerShell 2 HTML 2 Scheme 1 Python 1 Nemerle 1 Visual Basic .NET 1

Ecosyste.ms: Awesome

awesome-dotnet

Application Frameworks

HTML and CSS

PDF

Algorithms and Data structures

API

Application Templates

Assembly Manipulation

Assets

Authentication and Authorization

Build Automation

Business Intelligence

Caching

CLI

CLR

CMS

Code Analysis and Metrics

Compilers, Transpilers and Languages

Compression

Artificial Intelligence

Books

Code Snippets

Package Management

Continuous Integration

Cryptography

Database Drivers

Decompilation

DirectX

Distributed Computing

E-Commerce and Payments

Event aggregator and messenger

Game

GIS

GUI

HTTP

IDE

Image Processing

Install tools

IoC

Logging

Machine Learning and Data Science

Markdown Processors

Mathematics

Misc

MVVM

ORM

Protocols

Scheduling

State machines

Static Site Generators

Style Guide

Testing

Tools

Visual Studio Plugins

Web Frameworks

WebSocket

WPF

Serialization

Graphics