Are there any GUI toolkits built on top of HTML Canvas like swing,swt,gtk or qt? [closed]

Answer 1

Take a look at Ample SDK JavaScript UI Framework. One of the UI technologies it enables cross-browser is XUL, styleable in CSS and programmable in JavaScript with XUL DOM or jQuery APIs. You can also create your own UI technology on top of the framework.

Answer 2

kineticjs is a good one, uses layers dragndrop collisiondetection events sprites etc