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
Python MUD/MUX/MUSH/MU* development system
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.