xUnit.net is a free, open source, community-focused unit testing tool for the .NET Framework. Written by the original inventor of NUnit v2, xUnit.net is the latest technology for unit testing C# and F# (other .NET languages may work as well, but are unsupported). xUnit.net works with Visual Studio, Visual Studio Code, ReSharper, CodeRush, and TestDriven.NET. It is part of the .NET Foundation, and operates under their code of conduct. It is licensed under Apache 2 (an OSI approved license).

YamlDotNet is a YAML library for netstandard and other .NET runtimes.

YamlDotNet provides low level parsing and emitting of YAML as well as a high level object model similar to XmlDocument. A serialization library is also included that allows to read and write objects from and to YAML streams.

YARP (Yet Another Reverse Proxy) is a highly customizable reverse proxy built using .NET. The biggest differentiator between YARP and other reverse proxies is how it is built and packaged – YARP is supplied as a library and samples showing how to create a proxy that is customized to the needs of your specific scenarios.

The GraphQL client with LINQ like interface.

FusionCache is an easy to use, fast and robust hybrid cache with advanced resiliency features.

Zero allocation LINQ with LINQ to Span, LINQ to SIMD, and LINQ to Tree (FileSystem, JSON, GameObject, etc.) for all .NET platforms(netstandard2.0, 2.1, net8, net9) and Unity, Godot.

ZXing.Net is a port of ZXing, an open-source, multi-format 1D/2D barcode image processing library originally implemented in Java.

   It has been ported by hand with a lot of optimizations and improvements.

   It is compatible with .Net 2.0, .Net 3.5, .Net 4.x, .Net 5.x, .Net 6.x, .Net 7.x, Windows RT Class Library and Components, UWP, .Net Standard 1.x and 2.0x, .Net Core App 3.x, Silverlight 4, Silverlight 5, Windows Phone 7.x and Windows Phone 8.x and Xamarin.Android