AutoFixture is an open source library for .NET designed to minimize the 'Arrange' phase of your unit tests in order to maximize maintainability. Its primary goal is to allow developers to focus on what is being tested rather than how to setup the test scenario, by making it easier to create object graphs containing test data.

DocFX is a cross-platform, flexible, and customizable static site generator capable of creating documentation pages from Markdown and YAML complete with different layouts, a TOC, and reference APIs created from various languages. This project has been used to create several websites including the original docs.microsoft.com.

Game examples implemented as .NET console applications primarily for providing education and inspiration. :)

Windows Template Studio is a Visual Studio 2017 Extension that accelerates the creation of new Universal Windows Platform (UWP) apps using a wizard-based experience. The resulting UWP project is well-formed, readable code that incorporates the latest Windows 10 features while implementing proven patterns and best practices. Sprinkled throughout the generated code we have links Docs, Stack Overflow and blogs to provide useful insights.

Windows Presentation Foundation (WPF) is a UI framework for building Windows desktop applications. WPF supports a broad set of application development features, including an application model, resources, controls, graphics, layout, data binding and documents. WPF uses the Extensible Application Markup Language (XAML) to provide a declarative model for application programming.

Windows Forms (WinForms) is a UI framework for building Windows desktop applications. It is a .NET wrapper over Windows user interface libraries, such as User32 and GDI+. It also offers controls and other functionality that is unique to Windows Forms.

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.

Verify is a snapshot tool that simplifies the assertion of complex data models and documents.

The Windows Community Toolkit is a collection of controls for WinUI 2, WinUI 3, and Uno Platform developers. It simplifies and demonstrates common developer tasks building experiences for Windows with .NET.

Unity Container is a full featured, general-purpose IoC container for use in any type of .NET application.

A .NET library that provides access to the library that powers PyTorch.

A framework for developing multimedia-based applications.

Stride is an open-source C# game engine for realistic rendering and VR. The engine is highly modular and aims at giving game makers more flexibility in their development. It can be used to create not only games but can also serve as a foundation for apps and tools.

Steeltoe is an application framework that provides libraries for .NET Framework and .NET Core developers in order to build cloud-native applications and microservices.

Spectre.Console is a .NET 6/.NET Standard 2.0 library that makes it easier to create beautiful, cross platform, console applications.

Source Link is a language- and source-control agnostic system for providing first-class source debugging experiences for binaries. The goal of the project is to enable anyone building NuGet libraries to provide source debugging for their users with almost no effort. Microsoft libraries, such as .NET Core and Roslyn have enabled Source Link.

Silk.NET is your one-stop-shop for high-speed .NET multimedia, graphics, and compute; providing bindings to popular low-level APIs such as OpenGL, OpenCL, OpenAL, OpenXR, GLFW, SDL, Vulkan, Assimp, and DirectX. Use Silk.NET to spruce up your games and applications with cross-platform 3D graphics, audio, compute and haptics.

SignService aims to make it easier to integrate code signing into a CI process by providing a secured API for submitting artifacts to be signed by a code signing cert held on the server. It uses Azure AD and Azure Key Vault's HSM for security.

The Salesforce Toolkits for .NET provide an easy way for .NET developers to interact with the Force.com & Chatter REST APIs using native libraries.

The most popular tool to manage localization of all kind of applications with resx-based resources; one of the highest rated extensions on the Visual Studio Marketplace.