Cocos simplifies game creation and distribution with Cocos Creator
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Free game engine for development of desktop, mobile, and web games
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
Cross-platform game engine in Rust
The ioquake3 community effort to continue supporting/developing id's
Open source library for creative expression on the web, desktop, etc.
The game engine for everyone
A completely free, open-source, 2D game engine
2D JavaScript Physics Engine
A dead simple 2D game engine for Go
Free, open source game engine online
Game engine supporting many 3D/2D formats and graphic effects
The multiplayer game engine
MIT Licensed Open Source version of Torque3D from GarageGames
Engo is an open-source 2D game engine written in Go
Cross-platform 3D scene editor based on three.js, golang and mongodb
2D Game Engine
A cross-platform 2D game engine
Web powered cross-platform 3D, WebXR game engine
Multi-platform game engine similar to old Megaman with a stage editor
Turbulenz is a modular 3D and 2D game framework
Educational framework for OpenGLES, OpenCL and OpenAL