Top CSHARP GitHub Repositories & Tools (2026)

InkCanvasForClass Community Open Source Project

CADability is a pure .net class library for modeling and analyzing 3d data, both with your code and interactively. It comes with an optional Windows.Forms user interface, which can be adopted to other environments. It does not refer to other 3d modeling libraries. For data exchange you can use STEP, STL or DXF files.

🦴 2dog is Godot in .NET

A multi-framework control library of https://github.com/microsoft/fluentui-system-icons

A companion toolkit for the standard toolkit.

C# script editor and automation library for Windows

Highly Performant & Scalable Ultima Online Server Emulator

Valour is bringing communities into the future with unique features, blazing performance, and respect for users.

Self-hosted Enterprise and Personal AI + agent runtime in .NET (NativeAOT-friendly)

A high performance Vulkan/DX12 game engine in C++ & C#

The Chickensoft Game Demo — a fully tested, third-person 3D game built with Godot and C#. Now with saving and loading!

Browse the sample apps demonstrating Aspire integration across C#, JavaScript, TypeScript, Python, Go, containers, databases, cloud, AI, and observability scenarios.

An open-source project for Windows developers to learn how to add AI with local models and APIs to Windows apps.

Cross-platform .NET/Mono bindings for LibVLC

Enterprise-grade feature flag platform that you can self-host. Get started - free.

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

Undetectable, Fast, Cross-Platform, Free VPN

The official .NET library for the OpenAI API

A OneNote add-in with simple, yet powerful and useful features

Static site generator for .NET API documentation.