Hi,
Maybe you already know this site.
But provides you with an online code editor for flash programming (active script). Kenta Cho, has demos/games there and also there is some support for a 3d engine (alternativa3d):
http://wonderfl.net/user/ABA
http://wonderfl.net/search?q=Alternativa3D
Wonderfl - Build flash online
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Wonderfl - Build flash online
Close, but not there yet.