.NET Foundation Projects

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:


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


This repo contains the .NET Core runtime, called CoreCLR, and the base library, called System.Private.Corelib (or mscorlib). It includes the garbage collector, JIT compiler, base .NET data types and many low-level classes. We welcome contributions.


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


Home repository for .NET Core


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


This repo is building the .NET Standard


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


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.


The Home repository is the starting point for people to learn about ASP.NET Core.

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