Projects under the stewardship of the .NET Foundation currently include the .NET Compiler Platform ("Roslyn") as well as the ASP.NET family of projects, .NET Core, Xamarin Forms along with popular .NET open source frameworks like xUnit and Reactive Extensions. We’re actively engaged in supporting open source projects in the .NET ecosystem, you can learn more about our work or see our blog for the latest announcements.

Pick a project below to learn more about it and how to contribute:

  • Umbraco

    Umbraco is a free open source Content Management System built on the ASP.NET platform. It has award-winning integration capabilities and supports ASP.NET MVC or Web Forms, including User and Custom …

  • UWP Community Toolkit

    The UWP Community Toolkit is a collection of helper functions, custom controls, and app services. It simplifies and demonstrates common developer tasks building UWP apps for Windows 10. Project …

  • WCF

    WCF includes a collection of client-oriented libraries from the Windows Communication Foundation that enable WCF applications built on .NET Core to communicate with WCF services. These libraries …

  • Windows Phone Toolkit

    Straight from Microsoft Windows Phone developer platform team - Windows Phone Toolkit provides the developer community with new components, functionality, and an efficient way to help shape product …

  • WiX Toolset

    WiX Toolset provides the most powerful set of tools available to create your Windows installation experience. Seamlessly integrate installation package creation into your development process with …

  • WorldWide Telescope

    WorldWide Telescope is a visualization environment that enables a computer to function as a virtual telescope—bringing together archival imagery from the world’s best ground- and space-based …

  • Xamarin.Auth

    Xamarin.Auth is a cross-platform API for authenticating users and storing their accounts. Project Details Project Info Site Project Code Site Project License Type: Apache License 2.0 Project Main …

  • Xamarin.Mobile

    Xamarin.Mobile is an API for accessing common platform features, such as reading the user's address book and using the camera, across iOS, Android, and Windows Phone platforms. The goal of Xamarin. …

  • is a free, open source, community-focused unit testing tool for the .NET Framework. Written by the original inventor of NUnit v2, is the latest technology for unit testing C#, F#, …

  • corefx

    This repo contains the .NET Core foundational libraries, called CoreFX. It includes classes for collections, file systems, console, XML, async and many others.

  • coreclr

    This repo contains the .NET Core runtime, called CoreCLR, and the base library, called mscorlib. It includes the garbage collector, JIT compiler, base .NET data types and many low-level classes.

  • roslyn

    The .NET Compiler Platform ("Roslyn") provides open-source C# and Visual Basic compilers with rich code analysis APIs.

  • csharplang

    The official repo for the design of the C# programming language

  • core

    Home repository for .NET Core

  • EntityFramework

    Entity Framework Core is a lightweight and extensible version of the popular Entity Framework data access technology

  • standard

    This repo is building the .NET Standard

  • cli

    This repo contains the .NET Core command-line (CLI) tools, used for building .NET Core apps and libraries through your development flow (compiling, NuGet package management, running, testing, ...).

  • Mvc

    ASP.NET Core MVC is a model view controller framework for building dynamic web sites with clean separation of concerns, including the merged MVC, Web API, and Web Pages w/ Razor.

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