BaseUI –backgrounds liquid UI http://www.soundstep.com/blog/downloads/baseui
caurina.transitions.Tweener –every one probably know this one http://code.google.com/p/tweener
Sandy 3D Engine-one of the best around to use 3d engine http://www.flashsandy.org/tutorials/3.0/1-starting-with-sandy-3.0
Tweenr lite/Max atc` no need to say about this one http://blog.greensock.com/tweening-family-comparison/
GTwennBeta-still a Beta but look promise http://www.gskinner.com/libraries/gtween
There are a lot more out there feel free to share but those are the basic.
No need to tell; check copyrights if using them .
thanks for your collection. used only tweenlite.