The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.

Documentation for ASP.NET Core

Cloud Native application framework for .NET

The Microsoft Build Engine (MSBuild) is the build platform for .NET and Visual Studio.

Canonical actor model implementation for .NET with local + distributed actors in C# and F#.

Open XML SDK by Microsoft

Lightweight and fast library written in C# for reading Microsoft Excel files

SuperSocket is a high-performance, extensible socket server application framework for .NET. It provides a robust architecture for building custom network communication applications with support for…

Sample code referenced by the .NET documentation

NUnit Framework

Helix Toolkit is a collection of 3D components for .NET.

SDK for the SolarWinds Orion platform, including tools, documentation, and samples in PowerShell, C#, Go, Perl, and Java.

Fast Excel Reading and Writing in .Net