# .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.

* .NET Implementations
 * [.NET Core](https://github.com/dotnet/corefx) - Core .NET Framework
 * [Mono Project](https://github.com/mono/) - Cross-platform implementation of .NET Framework.

* Platforms
 * [Castle Project](https://github.com/castleproject) - Umbrella project for ActiveRecord, DynamicProxy, MonoRail, Windsor
 * [Catel](http://catelproject.com/) - Application platform with IoC, logging, reflection and much more that serves as a base for applications that must be ready for future growth.
 * [Cosmos](http://cosmos.codeplex.com/)
 
* Languages
 * [Dynamic Language Runtime](http://www.github.com/IronLanguages/main.git) - A toolkit for building dynamic languages for .NET.
 * [IronPython](http://ironpython.net) - A .NET implementation of the [Python](https://www.python.org) programming language, built on the DLR.
 * [IronRuby](http://ironruby.net) - A .NET implementation of the [Ruby](https://www.ruby-lang.org) programming language, built on the DLR.
 * [IronScheme](http://ironscheme.codeplex.com) - A R6RS conforming Scheme-like implementation based on the Microsoft DLR.
 * [Nemerle](https://github.com/rsdn/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.

* Security / Identity Management
 * [Thinktecture IdentityServer](https://github.com/thinktecture/Thinktecture.IdentityServer.v3)
 * [Thinktecture IdentityManager](https://github.com/thinktecture/Thinktecture.IdentityManager)

* Web CMS
 * [DNN (formerly DotNetNuke)](https://dotnetnuke.codeplex.com/) - Web content management platform (CMS).
 * [Orchard](http://www.orchardproject.net/) - A community-focused Content Management System built on the ASP.NET MVC platform.
 * [Suave](https://github.com/SuaveIO/suave) A lightweight web server and a set of combinators to manipulate route flow and task composition.
 * [Umbraco](http://umbraco.com/) - Web content management platform (CMS).
 * [WebSharper](https://bitbucket.org/IntelliFactory/websharper)  Web programming platform including a compiler from F# code to JavaScript.

* Web Frameworks
 * [Nancy](http://nancyfx.org) - A lightweight, low-ceremony, framework for building HTTP based services on .NET and Mono. 

* ADO.NET providers
 * [Npgsql](https://github.com/npgsql/npgsql) PostgreSQL 
 * [Firebird .NET client](https://sourceforge.net/p/firebird/NETProvider/) Firebird
 
* Libraries
 * [Algorithmia](https://github.com/SolutionsDesign/Algorithmia) Algorithms and Data structures
 * [AngleSharp](https://github.com/FlorianRappl/AngleSharp) - Ultimate angle brackets parser library. It parses HTML5, MathML, SVG and CSS to construct a DOM based on the official W3C specification.
 * [ArcGIS.PCL](https://github.com/davetimmins/ArcGIS.PCL)
 * [AzureNetQ](https://github.com/Roysvork/AzureNetQ) - An easy to use .NET API for Azure Service Bus.
 * [Cimbalino Toolkit](http://cimbalino.org/) - A set of useful and powerful tools that will help you build your Windows Platform applications.
 * [Coding4Fun Toolkit](http://coding4fun.codeplex.com/)
 * [ColoredConsole](https://github.com/colored-console/colored-console)
 * [Cricket](http://fsprojects.github.io/Cricket/) - Actor library
 * [DiffSharp](http://gbaydin.github.io/DiffSharp/) Automatic Differentiation Library
 * [DotNetOpenAuth](https://github.com/DotNetOpenAuth) - Library that adds support for your site visitors to login with their OpenIDs by just dropping an ASP.NET control onto your page.
 * [EasyNetQ](https://github.com/mikehadlow/EasyNetQ) - An easy to use .NET API for RabbitMQ.
 * [FeatureToggle](https://github.com/jason-roberts/FeatureToggle) - Simple, reliable feature toggles in .NET.
 * [FluentBootstrap](https://github.com/somedave/FluentBootstrap)
 * [FluentValidation](https://github.com/JeremySkinner/FluentValidation) - A small validation library for .NET that uses a fluent interface and lambda expressions for building validation rules.
 * [GongSolutions.Wpf.DragDrop](https://github.com/punker76/gong-wpf-dragdrop) A drag'n'drop framework for WPF.
 * [HudlFfmpeg](https://github.com/hudl/HudlFfmpeg) - A/V transcoding framework that helps build complex FFmpeg commands.
 * [ImageProcessor](http://imageprocessor.org/)
 * [Kentor.AuthServices](https://github.com/KentorIT/authservices) A SAML2 Service Provider for .NET.
 * [LibGit2Sharp](https://github.com/libgit2/libgit2sharp)
 * [Lucene.Net](https://github.com/apache/lucene.net)
 * [MahApps.Metro](https://github.com/MahApps/MahApps.Metro) - A toolkit for creating metro-style WPF applications.
 * [Math.NET Numerics](http://numerics.mathdotnet.com/) Provides methods and algorithms for numerical computations in science, engineering and every day use.
 * [Mjolnir](https://github.com/hudl/Mjolnir) - [Hystrix](https://github.com/Netflix/Hystrix)-inspired fault tolerance with circuit breakers and thread pools.
 * [NetTopologySuite](https://github.com/NetTopologySuite) A .NET port of the JTS Topology Suite.
 * [JSON.NET](http://json.net/) - Popular high-performance JSON framework for .NET
 * [NodaTime](http://nodatime.org/) - A better date and time API for .NET
 * [OsmSharp](https://github.com/OsmSharp) Mapping & Routing library.
 * [PocketSharp](https://github.com/ceee/PocketSharp)
 * [RestSharp](http://restsharp.org/) - Simple REST and HTTP API Client for .NET
 * [SharpDX](https://github.com/sharpdx/SharpDX) - SharpDX is a project delivering the full DirectX API for .NET on all Windows platforms.
 * [SharpMap](https://sharpmap.codeplex.com/) An easy-to-use mapping library for use in web and desktop applications
 * [Splat](https://github.com/paulcbetts/splat) - A library to make things cross-platform that should be.
 * [WpfToolkit](https://github.com/dotnetprojects/wpftoolkit) - Fork of the MS WPF Toolkit

* Model-View-ViewModel (MVVM) Frameworks
 * [Caliburn Micro](http://caliburnmicro.com/)
 * [Catel.MVVM](http://catelproject.com/)
 * [MVVM Cross](https://github.com/MvvmCross/MvvmCross)
 * [MVVM Light Toolkit](http://www.mvvmlight.net)
 * [Radical](https://github.com/RadicalFx/radical)
 * [ReactiveUI](https://github.com/reactiveui/ReactiveUI)
 * [Simple Mvvm Toolkit](http://simplemvvmtoolkit.codeplex.com/)

* Tools
 * [Fody](https://github.com/Fody/Fody) - Extensible tool for weaving .NET assemblies.
 * [FAKE](http://fsharp.github.io/FAKE/) Build automation system with capabilities which are similar to make and rake.
 * [FsEye](http://www.swensensoftware.com/fseye) A visual object tree inspector for the F# Interactive.
 * [FsPickler](http://nessos.github.io/FsPickler/) Serialization library that facilitates the distribution of .NET objects.
 * [FsharpLint](http://fsprojects.github.io/FSharpLint/) Lint tool for F#.
 * [GitLink](https://github.com/CatenaLogic/GitLink) - Command-line tool to make .NET open source accessible without the need for a symbols server
 * [GitVersion](https://github.com/ParticularLabs/GitVersion) - Use convention to derive a SemVer product version from a GitFlow based repository.
 * [Glimpse](http://getglimpse.com) - Providing real time diagnostics & insights to the fingertips of hundreds of thousands of developers daily.
 * [ILSpy](http://ilspy.net/) - ILSpy is the open-source .NET assembly browser and decompiler.
 * [Mini Profiler](http://miniprofiler.com/) - A simple but effective mini-profiler for .NET and Ruby.
 * [Paket](http://fsprojects.github.io/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.
 * [Protobuf-net](https://code.google.com/p/protobuf-net/) - A .NET implementation of protobuf, allowing you to serialize your .NET objects efficiently and easily.
 * [scriptcs](http://scriptcs.net/) - scriptcs makes it easy to write and execute C# with a simple text editor.
 * [Snoop WPF](https://github.com/cplotts/snoopwpf) - Snoop - The WPF Spy Utility
 * [Sql Bulk Copy Sync](https://github.com/WCOMAB/SqlBulkSync)
 * [Vagrant](http://nessos.github.io/Vagrant/) Automated dependency resolution and dynamic assembly compilation framework.

* Testing
 * [canopy](http://lefthandedgoat.github.io/canopy/) A web testing framework.
 * [FakeItEasy](https://github.com/FakeItEasy/FakeItEasy)
 * [FsCheck](https://fsharp.github.io/FsCheck/) A tool for testing .NET programs automatically.
 * [moq](https://github.com/Moq/moq4) - The most popular and friendly mocking framework for .NET
 * [NSubstitute](http://nsubstitute.github.io/) - A friendly substitute for .NET mocking frameworks.
 * [NUnit](https://github.com/nunit/nunit) - NUnit is a unit-testing framework for all .NET languages.
 * [tickspec](http://tickspec.codeplex.com/) A lightweight Behaviour Driven Development (BDD) framework.
 * [xUnit](https://github.com/xunit/xunit) - xUnit.net is a community-focused unit testing tool for the .NET Framework.

* Dependency Injection
 * [Autofac](http://autofac.org/) - Autofac is an addictive Inversion of Control container for .NET 4.5, Silverlight 5, Windows Store apps, and Windows Phone 8 apps.
 * [Funq](https://funq.codeplex.com/) - A fast DI container you can understand.
 * [Ninject for Desktop](http://www.ninject.org/) - Dependency injector for .NET
 * [Ninject for Portable Class Libraries, Universal apps and Xamarin](https://github.com/onovotny/ninject)
 * [TinyIoC](https://github.com/grumpydev/TinyIoC) - An easy to use, hassle free, Inversion of Control Container for small projects, libraries and beginners alike.

* Data Access
 * [Dapper](https://github.com/StackExchange/dapper-dot-net) - Dapper is a single file you can drop in to your project that will extend your IDbConnection interface.
 * [NHibernate](https://github.com/nhibernate) - Object Relational Mapper
 * [Simple Data](https://github.com/markrendle/Simple.Data) - A light-weight, dynamic data access component for C# 4.0.
 * [Sqlite-net](https://github.com/praeclarum/sqlite-net) - Simple, powerful, cross-platform SQLite client and ORM.
 * [NMEA Parser](https://github.com/dotMorten/NmeaParser) - Library for handling NMEA message in Windows Desktop, Store, Phone and Xamarin (Android + iOS), coming from files, Bluetooth, serial port or any stream.
 * [StackExchange.Redis](https://github.com/StackExchange/StackExchange.Redis)  
 * [SQL LocalDB Wrapper](https://github.com/martincostello/sqllocaldb)

* Games
 * [MonoGame](http://monogame.net) - One framework for creating powerful cross-platform games.
 * [Paradox](https://github.com/SiliconStudio/paradox) - Paradox is a versatile and engaging game engine.
 * [OpenRA](https://github.com/OpenRA/OpenRA) - An open-source implementation of the Command & Conquer: Red Alert engine using .NET/Mono and OpenGL.

* Control libraries
 * [Callisto](https://github.com/timheuer/callisto) - UI Control Toolkit for WinRT apps
 
* Windows Services
 * [TopShelf](https://github.com/Topshelf/Topshelf) 

* Scheduling
 * [Quartz.Net](https://github.com/quartznet/quartznet) 

* Consumer projects
 * [.NET open source consumer projects list](dotnet-consumer-projects.md)

This list is just a starting point - also take a look at all the projects on [CodePlex](http://www.codeplex.com/) and on [GitHub Trending C#](https://github.com/trending?l=csharp).

Thanks to [@slodge](http://twitter.com/slodge "@slodge on Twitter") for providing the initial list.

[@quozd](http://twitter.com/quozd "@quozd on Twitter") hosts an [Awesome .NET!](https://github.com/quozd/awesome-dotnet) list. Also worth checking out.