Game Development GitHub Repositories (2026) · Open Source Tools

Universal Programming Language & Translator

A refreshingly simple data-driven game engine built in Rust

Local image or text → game-ready 3D on your own machine. Retopology, repaint, rigging and animation helpers, in a web viewer and a CLI. Runs Pixal3D, TRELLIS.2, Hunyuan3D and SF3D. Apple Silicon and NVIDIA. Every result carries its licence.

AI Skills, MCP Tools, and CLI for Unity Engine. Full AI develop and test loop. Use cli for quick setup. Efficient token usage, advanced tools. Any C# method may be turned into a tool by a single line. Works with Claude Code, Gemini, Copilot, Cursor and any other absolutely for free.

Powerful web graphics runtime built on WebGL, WebGPU, WebXR and glTF

Redot Engine – Multi-platform 2D and 3D game engine

awesome game security [Welcome to PR]

A dead simple 2D game engine for Go

Godot-MCP — Model Context Protocol (MCP) integration for the Godot Engine. AI tools for the Godot Editor in C#, with cloud connection to ai-game.dev. Apache-2.0.

Complete Unreal Engine development toolkit exposed as MCP tools.

Reliable & unreliable messages over UDP. Robust message fragmentation & reassembly. P2P networking / NAT traversal. Encryption.

Dedicated Game Server Hosting and Scaling for Multiplayer Games on Kubernetes

AI chat and agent tooling for Godot, with both MCP support and in-built native chat window.

Dust3D is a cross-platform 3D modeling software that makes it easy to create low poly 3D models for video games, 3D printing, and more.

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

Stride (formerly Xenko), a free and open-source cross-platform C# game engine.

Tiny fast HTML5 game engine with many features and no dependencies.

3D C++ Game Engine - yet another open source game engine

fheroes2 is a recreation of Heroes of Might and Magic II game engine

Cross-Platform Level Editor