Phaser is a light-weight 2D game framework for making HTML5 games for desktop and mobile browsers
Super fast HTML 5 2D rendering engine that uses webGL with canvas fallback
Blend4Web is a tool for interactive 3D visualization on the Internet
:octopus: Superpowers — Extensible HTML5 app for real-time collaborative projects
A Joyful 2D HTML5 Game Engine.
A virtual joystick for touch capable interfaces.
phina.js is game library
GameJs is a thin library on top of the HTML canvas element. In addition to the drawing functions it has a set of generally helpful modules for game development.
Turbulenz is a modular 3D and 2D game framework for making HTML5 powered games for browsers and mobile devices.
Panda.js HTML5 game engine
a 2D rigid body physics engine for the web