The FuseKit is really good, but it hasn’t been updated for AS3 yet. If you are working on AS3 projects you can use Tweener as a replacement. Tweener doesn’t have as many options but it will cover most of your animation needs and it’s just as easy to use. It’s much easier than to use than the flash Tween class.
Here’s a link to the Documentation for Tweener. You can get the source code for Tweener here.