Phaser is a light-weight 2D game framework for making HTML5 games for desktop and mobile browsers
Panda.js HTML5 game engine
Super fast HTML 5 2D rendering engine that uses webGL with canvas fallback
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.
Framework for HTML5 Canvas oriented 2D video games
A Joyful 2D HTML5 Game Engine.
html5 game engine optimized for rapid development
Kiwi.js is a blazingly fast mobile & desktop browser based HTML5 game framework. It uses CocoonJS for publishing to the AppStore.
Frozen is an open-source HTML5 game engine delivering ease-of-use, rapid development through tooling and modularity.
JSIso - An HTML5 Canvas Tile Engine