Squirrel
Various sites that host Flash classes and Flash class libraries that I’ve found useful.
AnimationPackage - Supercharged animation, tweening and drawing in Flash. Comes with a learning curve, but well worth it.
http://www.alex-uhlmann.de/flash/animationpackage/

Betriebsraum classes - Status Box (modal dialog), Tree Menu, Text writer (typewriter effect) and others.
http://www.betriebsraum.de/main.php

FLASH.INIT() - LocalNet, Elastic Engine (resizing window and UI components), Shortcuts Engine (keyboard shortcuts), Hints Engine (tooltips), JS Class (JavaScript/Flash/HTML functionality)
http://www.potapenko.com/eng/framework.htm

XFactorStudio - XPath for ActionScript 2. Makes processing and searching XML much more intuitive.
http://www.xfactorstudio.com/ActionScript/AS2/XPath/

ASCB by Person13 - Various and sundry Flash classes. Examples include: Color Selector, Calculator, Audio Queue, Form Manager, Table, Window, Pen etc. etc.
http://www.person13.com/ascblibrary/

Rober Penner Tweening Classes - Many drawing and animation classes rely on these tweening classes.
http://www.robertpenner.com/easing/

Layer51 Proto - Flash classes and prototypes. I highly recommend XMLSA (XML Simple Array), Tooltip class and though I haven’t used it extensively, LoadQue Class.
http://proto.layer51.com/ap.aspx

LuminicBox - Debugging in Flash. Many, many improvements over using trace. The website is in Spanish, but if you can find the download link the documentation is in English.
http://www.luminicbox.com/blog/?page=post&id=2

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