Unity3d GitHub Repositories (2026) · Open Source Tools

GUI application to analyze game files

OpenZ: the faithful open-source 3D fan remake of Z (The Bitmap Brothers, 1996) for its 30th anniversary. Free, never sold, 100% original assets.

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

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

AI automation skills specifically designed for Unity

Cross-platform on-device AI toolkit

Let AI Drive Unity, from Editor to Play Mode.

DeepSeek Harness plugin: control the Unity Editor through the unity CLI

Unity MCP acts as a bridge between AI assistants and your Unity Editor. Give your LLM tools to manage assets, control scenes, edit scripts, and automate tasks within Unity.

Godot/Unity3D System Design Architecture

An open-source, multiplayer modification for the game Subnautica.

Open Brush is the open source, community led evolution of Tilt Brush! Forked from https://github.com/googlevr/tilt-brush

A love letter to the Elite Dangerous racing community ❤

Open source Role Playing Game engine for Unity 3D written in C#.

Roslyn analyzers for Unity game developers

A Unity extension for inspector enhancement and data serialization.

Provides a service to install NuGet packages into a Unity project via the Unity Package Manager

Easy to use high performance Network library for Unity 3d

Blockchain in C#/.NET for on-chain, decentralized gaming

:video_game: Visual Pinball Engine for Unity