A retro game engine for Python
A 2D rigid body physics engine for the web
A high-performance, industry-standard 2D physics engine built on Box2D
2D JavaScript Physics Engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Voxel game-creation platform with easy modding and game creation
Free game engine for development of desktop, mobile, and web games
The HTML5 Creation Engine
The game engine for everyone
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Open source library for creative expression on the web, desktop, etc.
High performance UI layout library in C
Cocos simplifies game creation and distribution with Cocos Creator
The ioquake3 community effort to continue supporting/developing id's
3D game engine/framework in C, with Luajit and Python bindings now
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
JavaScript-based game engine designed to empower developers
A dead simple 2D game engine for Go
The Tiny JavaScript Game Engine That Can!
A completely free, open-source, 2D game engine
Cross-platform game engine in Rust
3D and 2D game engine written in Rust
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
Game engine supporting many 3D/2D formats and graphic effects
Full featured MUD server with all the trimmings.