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
Framework for HTML5 Canvas oriented 2D video games
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.
html5 game engine optimized for rapid development
Super fast HTML 5 2D rendering engine that uses webGL with canvas fallback
A Joyful 2D HTML5 Game Engine.
HTML5 game framework for web and iOS