Best open-source C# projects

A modern, open-source Windows cleaner built with WinUI 3 that removes junk files using community winapp2.ini cleaning rules.

Windows tool for viewing and editing NVIDIA driver profile settings, including many hidden options not exposed in the NVIDIA Control Panel.

A Windows 10/11 tray app that reveals your desktop when you click empty wallpaper or taskbar space, like macOS Sonoma.

A Model Context Protocol (MCP) plugin that lets AI coding assistants like Cursor, Claude Code and Codex control and query the Unity Editor.

A uGUI-based in-game console for Unity that shows runtime logs and lets you run registered debug commands in builds.

Allocation-free async/await integration for Unity that makes Unity AsyncOperations, coroutines and events awaitable, running on PlayerLoop without threads.

A Unity extension that adds 2D navigation mesh generation and pathfinding for tilemap, sprite and Collider2D top-down games.

Official Unity integration for Yarn Spinner, a screenplay-style dialogue system for running branching conversations in games.

Unity Editor and runtime plugin and MCP server that lets AI agents like Claude, Cursor and Copilot operate Unity projects and run LLMs inside games.

A desktop and VS Code tool for building, editing and comparing JSON documents, plus generating JSON from programming language classes.

A Windows-first graphical interface that manages software installs and updates across WinGet, Scoop, Chocolatey, Homebrew, APT, pip, npm and more.

A desktop Swiss Army knife for developers, bundling about 30 small tools for encoding, formatting, converting, testing and generating data.

Windows OCR utility that captures text from screen regions, images, PDFs and files, runs locally, and copies or routes the result.

Free, open-source desktop file converter you use by dragging files onto a format donut, with 240+ formats converted offline.

An MCP server and CLI that let AI agents automate the real Microsoft Excel application on Windows via its COM API.