Csharp GitHub Repositories (2026) · Open Source Tools

MCP Gateway is a reverse proxy and management layer for MCP servers, enabling scalable, session-aware stateful routing and lifecycle management of MCP servers in Kubernetes environments.

Cairo is a customizable, intuitive desktop environment for Windows.

A tiny simple, elegant, internet radio player for Windows which lives completely in the tray.

Event-driven algorithmic trading engine for .NET. Write a strategy once and run it unchanged in backtest, paper and live trading, deterministic, with fixed-point money and adapters for Binance, Bybit, OKX, Kraken, Bitget, Gate, KuCoin and Hyperliquid.

A .NET source generator for generating object mappings. No runtime reflection.

Scalable open-source game backend server: multiplayer, matchmaking, leaderboards, chat, and social features for games.

Phone Link / KDE Connect alternative

PixiEditor is a Universal Editor for all your 2D needs

A cross-platform 2D game engine with its own programming language and IDE.

DotRecast - a C# port of Recast & Detour, Industry-standard navigation mesh toolset for .NET, Unity3D, games, servers

Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The future of .NET UI

The Free Software Media System - Server Backend & API

Unified access to native system APIs (windows, tray icons, menus, displays, dialogs, …) for Dart/Flutter, Rust, C#, JS/TS and Python, built on one C++ core.

Open source tool to safely clean orphaned Windows Installer files and reclaim disk space

Windows Calculator: A simple yet powerful calculator that ships with Windows

A simple cross platform ACME client (for use with Let's Encrypt et al.)

Microsoft Fluent UI Blazor components library. For use with ASP.NET Core Blazor applications

AI coding agent for Visual Studio 2022/2026 — chat, inline completion, and five autonomous agents that explore, plan, patch, and verify builds. Works with the official DeepSeek API or any OpenAI-compatible endpoint.

Python for .NET is a package that gives Python programmers nearly seamless integration with the .NET Common Language Runtime (CLR) and provides a powerful application scripting tool for .NET developers.

C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.