There are many popular open source tweening engines in the Flash community today. Numbered among these are Tweener, TweenLite/Tweenmax, Tweensy, and GTween. This is a short look at the capabilities of newcomer to the scene: BetweenAS3. BetweenAS3 is the tweening engine brainchild of Yoshihiro (yossy) Shindo and is available as part of the Spark project (i.e. it is brought to us by one of the same group that brought the world the FLARToolkit for Augmented Reality in Flash and countless other goodies).
Code a Chaotic Composition Inspired by Joshua Davis
Tutorial: Using CSS in AS3
Create a Windmill Effect Photo Gallery
Create a 3D perspective movement
Reusable Flash Uploader with ActionScript 3.0 & PHP
Create a “Where’s Wally” 2-Dimensional Sliding Content
Flash Flip Letter Effect
Create a Random Animated Color Text Effect
Create an Auto-Scrolling Vertical Content
Create an Analog Clock Screensaver