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.
phina.js is game library
A virtual joystick for touch capable interfaces.
Lightweight, fast, interactable 2D HTML5 rendering engine for cross-platform game development.
Blend4Web is a tool for interactive 3D visualization on the Internet
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.
a 2D rigid body physics engine for the web
:octopus: Superpowers — Extensible HTML5 app for real-time collaborative projects
Framework for HTML5 Canvas oriented 2D video games
JSIso - An HTML5 Canvas Tile Engine
html5 game engine optimized for rapid development
A Joyful 2D HTML5 Game Engine.
Frozen is an open-source HTML5 game engine delivering ease-of-use, rapid development through tooling and modularity.