Recently I saw very nice IDE, designed for the HTML5 in the beta stage.
You can work with vector graphics, timeline-based animations, and more.
It’s a Radi!
Check out some examples:
canvas
video
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A bad copy of flash IDE…
Instead of this app check : http://labs.adobe.com/technologies/edge/
Thanks, Edge is a awesome IDE to build HTML5 content even at its current state indeed. And Edge was not available for the public at that moment.