Game Development GitHub Repositories (2026) · Open Source Tools

The open-source studio for making games with AI. Your own one-person game studio. Everything you need to make games with AI, in one app. Game canvas. Bring your own key.

A refreshingly simple data-driven game engine built in Rust

The ultimate harness for coding agents and beyond. All your agents. All your machines. One command center. Start with code, then follow your curiosity and build across disciplines: CAD, circuits, robots, games and music.

Tiny fast 2D/3D HTML5 game engine with many features and no dependencies.

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

Unreal Engine Vibe Coding tool

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

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

Space exploration, trading, and combat game.

Complete Unreal Engine development toolkit exposed as MCP tools.

Game engine for 2D and 3D projects with entity component system (ECS) and data-oriented design

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

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.

A multi core friendly rigid body physics and collision detection library. Written in C++. Suitable for games and VR applications. Used by Horizon Forbidden West and Death Stranding 2.

Open-source, single-player Travian alternative inspired by Travian T4 and Travian Kingdoms

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.

A flexible, memory compact, fast and dynamic CSG implementation on top of three-mesh-bvh

Godot JVM GDExtension. Support Kotlin, Java and Scala.