ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.

:cake: Cake (C# Make) is a cross platform build automation system.

ML.NET is an open source and cross-platform machine learning framework for .NET.

Headless Chrome .NET API

xUnit.net is a free, open source, community-focused unit testing tool for .NET.

Google's Material Design in XAML & WPF, for C# & VB.Net.

A cross-platform plotting library for .NET

Lean Algorithmic Trading Engine by QuantConnect (Python, C#)

Command line parsing, invocation, and rendering of terminal output.

EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations.

One framework for creating powerful cross-platform games.

Powerful .NET library for benchmarking

Mutation testing for .NET core and .NET framework!

.NET for Apache® Spark™ makes Apache Spark™ easily accessible to .NET developers.

.NET API Gateway

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.

This repository contains a suite of libraries that provide facilities commonly needed when creating production-ready applications.

A wrapper executable that can run any executable as a Windows service, in a permissive license.

Open-source platform for building cross-platform native Mobile, Web, Desktop, and Embedded apps from a single C#/XAML codebase. Work from any IDE/CLI with Hot Reload, Visual Designer, MCPs, and Skills built for modern .NET workflows. 200M+ NuGet downloads.