Cocos2D for HTML5
cocos2d-javascript.org
cocos2d-javascript.org
Another HTML5 demo: http://www.cocos2d-iphone.org/t/js-tests/tests/
[1] http://impactjs.com/ejecta/ [2] http://www.ludei.com/tech/cocoonjs
(Disclaimer I am one of the founders of Game Closure) Game Closure provides a complete HTML5/Web/Native game development SDK with a larger focus on tooling than these projects[3]. The website is a little light on details - send me mail if you're interested!
[1] http://www.cocos2d-x.org/projects/cocos2d-x/wiki/Download [2] http://www.cocos2d-x.org/projects/cocos2d-x/wiki/Html5 [3] http://gameclosure.com/