Desktop/Android/HTML5/iOS Java game development framework
Open source HTML5 game framework that offers WebGL and Canvas
Open source library for creative expression on the web, desktop, etc.
JavaScript framework to build game engines, games, emulators and apps
Molecular viewer and prototyping framework
The imaginary eight-bit machine
A complete web framework to create online Fighting Fantasy adventures
Modular Gaming Open Source Persistent Browser Based Game Framework
An extensible development framework for roleplay games.
Powerful html5 & javascript library for creating applications & games.
Formerly CraveJs, it's for creating JavaScript applications and games.