Phaser is a light-weight 2D game framework for making HTML5 games for desktop and mobile browsers
A virtual joystick for touch capable interfaces.
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.
Panda.js HTML5 game engine
Frozen is an open-source HTML5 game engine delivering ease-of-use, rapid development through tooling and modularity.
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
a 2D rigid body physics engine for the web
A Joyful 2D HTML5 Game Engine.