HTween is yet another tween engine for both ActionScript 3.0 and haXe. It is designed to be extremely lightweight and fast performing.
It is not very feature rich compared to other tween engines but it’s purpose is not top all those, and they all do a good job at what they do, but to provide more simplistic features in a lightweight and fast way.
To cut to the chase, HTween “only” tweens numerical properties of any object and doesn’t bother with other stuff. Although it does have the feature that numbers put in quotes ("#") is relative as opposed to absolute, and there’s some ‘special’ properties that you can specify that you couldn’t really be without, such as onUpdate and onComplete.
Check it out at http://hesselboom.com/blog/2009/01/htween-the-light-weight-tween-engine/ and check out a speed performance comparison I did against TweenLite (the fastest tween engine I could find) at http://hesselboom.com/blog/2009/02/htween-vs-tweenlite-king-of-the-hill/
I would love any feedback on the engine and your results from the comparison.