Egret is a brand new open mobile game and application engine which allows you to quickly build mobile games and apps on Android,iOS and Windows.
Blend4Web is a tool for interactive 3D visualization on the Internet
A virtual joystick for touch capable interfaces.
Panda.js HTML5 game engine
Framework for HTML5 Canvas oriented 2D video games
a 2D rigid body physics engine for the web
:octopus: Superpowers — Extensible HTML5 app for real-time collaborative projects
Turbulenz is a modular 3D and 2D game framework for making HTML5 powered games for browsers and mobile devices.
Phaser is a light-weight 2D game framework for making HTML5 games for desktop and mobile browsers