Flint Particle System
http://flintparticles.org/

Away3D
http://away3d.com/

ds – data structures for AS3
http://code.google.com/p/polygonal/wiki/DataStructures

GAIA Flash Framework
http://www.gaiaflashframework.com/
寫網站時試用，包了 swfAddress 同自動分頁

Papervision 3D
http://blog.papervision3d.org/
不用介紹吧，正在研究

PureMVC
http://puremvc.org/
MVC Model，還在研究中

XIFF
http://www.igniterealtime.org/
做 real-time community 用，例如 chatting，還在研究中

TweenLite
http://www.greensock.com/tweenlite/
做 motion tween 用

JiglibFlash
http://www.jiglibflash.com/blog/
Physics Engine For 3D，還在研究中

CASA Lib
http://casalib.org/
提供一大堆有用既 Class

BetweenAS3 (TweenLite d friend)
http://www.be-interactive.org/works/20090911/slide_betweenas3.html

Popforge
http://code.google.com/p/popforge/
Sound Library

Five3D
http://five3d.mathieu-badimon.com/
主要用翻 flash 10 個 3D engine 去做既 library