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.NET Open Source Developer Projects
There are many .NET open source developer projects. You can always use a search engine to find projects, and that's a good approach. This list is intended to provide a showcase for projects that want it and to be community maintained. PR a change in and it will be accepted (modulo duplicates). Projects should be sorted alphabetically provide a one-line description and GitHub (or source) links are preferred over marketing sites.
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.NET Implementations
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.NET Core - Core .NET Framework
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Mono Project - Cross-platform implementation of .NET Framework.
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Platforms
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Castle Project - Umbrella project for ActiveRecord, DynamicProxy, MonoRail, Windsor
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Catel - Application platform with IoC, logging, reflection and much more that serves as a base for applications that must be ready for future growth.
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Languages
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Dynamic Language Runtime - A toolkit for building dynamic languages for .NET.
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IronPython - A .NET implementation of the Python programming language, built on the DLR.
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IronRuby - A .NET implementation of the Ruby programming language, built on the DLR.
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IronScheme - A R6RS conforming Scheme-like implementation based on the Microsoft DLR.
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Nemerle A high-level statically-typed programming language which offers functional, object-oriented and imperative features and has a simple C# like syntax and a powerful meta-programming system.
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Security / Identity Management
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Web CMS
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DNN (formerly DotNetNuke) - Web content management platform (CMS).
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Orchard - A community-focused Content Management System built on the ASP.NET MVC platform.
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Suave A lightweight web server and a set of combinators to manipulate route flow and task composition.
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Umbraco - Web content management platform (CMS).
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WebSharper Web programming platform including a compiler from F# code to JavaScript.
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Web Frameworks
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Nancy - A lightweight, low-ceremony, framework for building HTTP based services on .NET and Mono.
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ADO.NET providers
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Npgsql PostgreSQL
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Firebird .NET client Firebird
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Libraries
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Algorithmia Algorithms and Data structures
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AngleSharp - Ultimate angle brackets parser library. It parses HTML5, MathML, SVG and CSS to construct a DOM based on the official W3C specification.
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AzureNetQ - An easy to use .NET API for Azure Service Bus.
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Cimbalino Toolkit - A set of useful and powerful tools that will help you build your Windows Platform applications.
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Cricket - Actor library
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DiffSharp Automatic Differentiation Library
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DotNetOpenAuth - Library that adds support for your site visitors to login with their OpenIDs by just dropping an ASP.NET control onto your page.
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EasyNetQ - An easy to use .NET API for RabbitMQ.
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FeatureToggle - Simple, reliable feature toggles in .NET.
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FluentValidation - A small validation library for .NET that uses a fluent interface and lambda expressions for building validation rules.
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GongSolutions.Wpf.DragDrop A drag'n'drop framework for WPF.
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HudlFfmpeg - A/V transcoding framework that helps build complex FFmpeg commands.
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Kentor.AuthServices A SAML2 Service Provider for .NET.
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MahApps.Metro - A toolkit for creating metro-style WPF applications.
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Math.NET Numerics Provides methods and algorithms for numerical computations in science, engineering and every day use.
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Mjolnir - Hystrix-inspired fault tolerance with circuit breakers and thread pools.
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NetTopologySuite A .NET port of the JTS Topology Suite.
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JSON.NET - Popular high-performance JSON framework for .NET
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NodaTime - A better date and time API for .NET
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OsmSharp Mapping & Routing library.
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RestSharp - Simple REST and HTTP API Client for .NET
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SharpDX - SharpDX is a project delivering the full DirectX API for .NET on all Windows platforms.
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SharpMap An easy-to-use mapping library for use in web and desktop applications
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Splat - A library to make things cross-platform that should be.
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WpfToolkit - Fork of the MS WPF Toolkit
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Model-View-ViewModel (MVVM) Frameworks
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Tools
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Fody - Extensible tool for weaving .NET assemblies.
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FAKE Build automation system with capabilities which are similar to make and rake.
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FsEye A visual object tree inspector for the F# Interactive.
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FsPickler Serialization library that facilitates the distribution of .NET objects.
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FsharpLint Lint tool for F#.
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GitLink - Command-line tool to make .NET open source accessible without the need for a symbols server
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GitVersion - Use convention to derive a SemVer product version from a GitFlow based repository.
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Glimpse - Providing real time diagnostics & insights to the fingertips of hundreds of thousands of developers daily.
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ILSpy - ILSpy is the open-source .NET assembly browser and decompiler.
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Mini Profiler - A simple but effective mini-profiler for .NET and Ruby.
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Paket Dependency manager for .NET and Mono projects, which is designed to work well with NuGet packages and also enables referencing files directly from GitHub repositories.
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Protobuf-net - A .NET implementation of protobuf, allowing you to serialize your .NET objects efficiently and easily.
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scriptcs - scriptcs makes it easy to write and execute C# with a simple text editor.
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Snoop WPF - Snoop - The WPF Spy Utility
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Vagrant Automated dependency resolution and dynamic assembly compilation framework.
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Testing
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canopy A web testing framework.
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FsCheck A tool for testing .NET programs automatically.
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moq - The most popular and friendly mocking framework for .NET
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NSubstitute - A friendly substitute for .NET mocking frameworks.
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NUnit - NUnit is a unit-testing framework for all .NET languages.
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tickspec A lightweight Behaviour Driven Development (BDD) framework.
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xUnit - xUnit.net is a community-focused unit testing tool for the .NET Framework.
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Dependency Injection
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Autofac - Autofac is an addictive Inversion of Control container for .NET 4.5, Silverlight 5, Windows Store apps, and Windows Phone 8 apps.
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Funq - A fast DI container you can understand.
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Ninject for Desktop - Dependency injector for .NET
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Ninject for Portable Class Libraries, Universal apps and Xamarin
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TinyIoC - An easy to use, hassle free, Inversion of Control Container for small projects, libraries and beginners alike.
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Data Access
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Dapper - Dapper is a single file you can drop in to your project that will extend your IDbConnection interface.
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NHibernate - Object Relational Mapper
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Simple Data - A light-weight, dynamic data access component for C# 4.0.
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Sqlite-net - Simple, powerful, cross-platform SQLite client and ORM.
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NMEA Parser - Library for handling NMEA message in Windows Desktop, Store, Phone and Xamarin (Android + iOS), coming from files, Bluetooth, serial port or any stream.
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Games
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MonoGame - One framework for creating powerful cross-platform games.
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Paradox - Paradox is a versatile and engaging game engine.
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OpenRA - An open-source implementation of the Command & Conquer: Red Alert engine using .NET/Mono and OpenGL.
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Control libraries
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Callisto - UI Control Toolkit for WinRT apps
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Windows Services
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Scheduling
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Consumer projects
This list is just a starting point - also take a look at all the projects on CodePlex and on GitHub Trending C#.
Thanks to @slodge for providing the initial list.
@quozd hosts an Awesome .NET! list. Also worth checking out.