What is the best Actionscript3 3D Engine?

Question

I am looking for a somewhat detailed explanation of which 3D Engine for Actionscript3 is the most efficient, practical, scalable, documented, community supported, etc. When

Answer 1

I've used Papervision, Away3D, Alternativa and Sandy 3D (you can find tutorials for each here). I personally like Away3D better - it is free and has more features, as well as a Lite version if you just want the basics. I'm especially looking forward to the Haxe version, which might just let you compile stand alone executables in C++ with hxcpp.