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
Full featured MUD server with all the trimmings.
Game engine supporting many 3D/2D formats and graphic effects
Free, open source game engine online
online 4X browser game engine
A space race game in the style of A Dark Room
Turbulenz is a modular 3D and 2D game framework
Educational framework for OpenGLES, OpenCL and OpenAL
2D physics engine for games
Java Client + JS/Canvas Server-Side System, with maintained Objects
Game engine supporting many 3D/2D formats and graphic effects
Free MMORPG Engine. Develop and host graphical browser-based games.