Mono GitHub Repositories (2026) · Open Source Tools

.NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!

The World's First Universal Mod Loader for Unity Games compatible with both Il2Cpp and Mono

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.

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.

A library for patching, replacing and decorating .NET and Mono methods during runtime

NLog - Flexible and Structured Logging for various .NET Platforms

Non-Blocking Reactive Foundation for the JVM

Lite reliable UDP library for Mono and .NET

Cecil is a library to inspect, modify and create .NET programs and libraries.

TCP/HTTP/UDP/QUIC client/server with Reactor over Netty

C# modding swiss army knife, powered by cecil.

Additional optional modules for the Reactor project

You want to use managed-midi/managed-midi instead wherever it works. Or switch to Kotlin ktmidi as I did. / [Past project] Cross-platform MIDI processing library for mono and .NET (ALSA, CoreMIDI, Android, WinMM and UWP).

C# command line tool for running tests on Android / iOS / tvOS devices and simulators