• SPEED – I’m not aware of any popular tweening engine with a similar feature set that’s as fast as TweenMax. See the speed comparisons yourself.
• Feature set – In addition to tweening ANY numeric property of ANY object, TweenMax can tween filters, hex colors, volume, tint, frames, saturation, contrast, hue, colorization, brightness, and even do bezier tweening, orientToBezier, pause/resume, reverse(), restart(), round values, jump to any point in the tween with the “progress” property, automatically rotate in the shortest direction, plus LOTS more. Overwrite management is an important consideration for a tweening engine as well which is another area where the GreenSock tweening platform shines. You have options for AUTO overwriting or you can manually define how each tween will handle overlapping tweens of the same object.
• Expandability – With its new plugin architecture, you can activate as many (or as few) features as your project requires. Or write your own plugin if you need a feature that’s unavailable. Minimize bloat, and maximize performance.
• Management features – TweenGroup makes it surprisingly simple to create complex sequences and groups of TweenLite/Max tweens that you can pause(), resume(), restart(), or reverse(). You can even tween a TweenGroup’s “progress” property to fastforward or rewind the entire group/sequence.
• Ease of use – Designers and Developers alike rave about how intuitive the GreenSock tweening platform is.
• Updates – Frequent updates and feature additions make the GreenSock tweening platform reliable and robust.
• AS2 and AS3 – Most other engines are only developed for AS2 or AS3 but not both.

www.TweenMax.com

Default Macromedia Tween class has many limits. One of that limits is that it can’t tween objects or its properties. Let say you need to tween movie RGB colors which are tightly connected with ColorTransform and Transform objects. During achivement of this goal I try to reuse Macromedia Tween class original code more as I can. Less code for me less changes for you.

http://flashenabled.wordpress.com/2007/05/30/tutorial-extending-tween-class-tweenex-by-winx/ 

http://www.uza.lt/codex/as3-easing/

Tweener is an animation and transition class. It’s what I use for creating dynamic animations via code, like button rollover states, fades, and other visual effects (and to avoid using the timeline for just about anything). And, although it obeys a slightly different syntax philosophy, it’s the spiritual successor to my MC Tween.

http://labs.zeh.com.br/blog/?page_id=97#tweener

AnimationPackage helps you to create powerful, maintainable animations and primitive shapes in an efficient and easy way. At the same time it keeps your file size down because many parts of it are reused and only the classes you need are imported to your project. AnimationPackage 2 is an ActionScript 2.0 library and it is compatible to Flash Player 8 and above.

http://www.alex-uhlmann.de/flash/animationpackage/ap2

Note: Animation Package 1 is also available for Flash Players 6 and above. Get it here.

• Bobbing
• Circular
• Elliptical
• Pulse

http://www.whatstyle.net/articles/actionscript_animation_classes/ 

http://www.airtightinteractive.com/news/?p=38 

http://www.senocular.com/flash/actionscript.php?file=ActionScript_2.0/com/senocular/drawing/ShapeTween.as

Part of senocular’s Actionscript library.

Creates functions to be used for independantly moving particle movie clips. Functions (or “behaviors” created with the ParticleBehavior class are self- contained and are typically assigned to a particle movie clip’s onEnterFrame event handler. Particle movie clips you would create on your own

http://www.senocular.com/flash/actionscript.php?file=ActionScript_2.0/ParticleBehavior.as

Part of senocular’s Actionscript library.

http://www.senocular.com/flash/actionscript.php?file=ActionScript_2.0/ColorFader.as 

Part of senocular’s Actionscript library.