AS3.0 Libraries

3D Engines

• Papervision3D
  http://blog.papervision3d.org/
• Away 3D
  http://www.away3d.com/
  
• Sandy 3D
  http://www.flashsandy.org/
  
• Alternativa Platform
  http://blog.alternativaplatform.com/en/
  
• FIVe3D
  http://five3d.mathieu-badimon.com/
  
• WireEngine3D (we3d) - A lightweight and fast 3D Engine for Flash 8/9.
  http://osflash.org/we3d/
  
• Sharikura
  http://temp.roxik.com/datas/physics/

3D Game Engines

• PaperWorld 3D
  http://paperworld3d.com/

3D Animation Framework

• Cast3D
  http://www.cast3d.org/

3D Physics Engines

• WOW-Engine
  http://seraf.mediabox.fr/wow-engine/
• jiglibflash
  http://www.jiglibflash.com/blog/

Animation Tweening Kits

• Tweener - A class for creating tweens in actionscript 2 and 3 - because there’s infinity between 0 and 1.
  http://code.google.com/p/tweener/
  
• TweenLite
  http://blog.greensock.com/tweenliteas3/
  
• TweenMax
  http://blog.greensock.com/tweenmaxas3/
  
• Tweensy
  http://www.lostinactionscript.com/blog/index.php/2008/08/31/as3-tween-engine-tweensy-preview/
  
• GoASAP (ActionScript Animation Platform)
  http://www.goasap.org/
  
• AS3 Animation System 2.0
  http://www.boostworthy.com/blog/?p=170
  
• Animation Package
  http://www.alex-uhlmann.de/flash/animationpackage/
  
• KitchenSync - KitchenSync is an ActionScript 3.0 library for sequencing animations and other time-based actions.
  http://code.google.com/p/kitchensynclib/
  
• Gyro - A tween and animation library for ActionScript 3
  http://code.google.com/p/gyro-actionscript-animation/
  
• gTween
  http://www.gskinner.com/blog/archives/2008/08/gtween_a_new_tw.html
  
• HydroTween + HydroSequence (based on GoASAP)
  http://blog.hydrotik.com/2008/07/19/hydrotween-hydrosequence-rev32/
  
• AS3 Easing
  http://www.uza.lt/codex/as3-easing/
  
• Twease
  http://code.google.com/p/twease/
• BetweenAS3
  http://www.be-interactive.org/works/20090428/slide_betweenas3.html

2D Physics Engines

• APE (Actionscript Physics Engine)
  http://www.cove.org/ape/index.htm
  
• Box2DFlashAS3
  http://box2dflash.sourceforge.net/
  
• FOAM - 2D Rigid Body Physics Engine
  http://code.google.com/p/foam-as3/
  
• glaze - 2D Rigid Body Dynamics & Game Engine for Actionsctipt 3
  http://code.google.com/p/glaze/
  
• motor2
  http://lab.polygonal.de/motor_physics/
  
• Fisix Engine
  http://www.fisixengine.com/default.asp
  
• PopShapes
  http://lab.andre-michelle.com/physics-engine/

Security

• AS3Crypto
  http://crypto.hurlant.com/

Audio Libraries

• Popforge - ActionScript 3 code sandbox for various packages
  http://code.google.com/p/popforge/

Particle Systems

• FLiNT
  http://flintparticles.org/
  
• Partigen (Not free)
  http://desuade.com/products/partigen/
• Pulse Particle System - A general purpose AS3 particle system.
  http://www.rogue-development.com/pulseParticles.html
• Emitter - ActionScript 3.0 particle FX engine
  http://code.google.com/p/emitter/

Data Visualization

• Flare - Create interactive data visualizations for the web
  http://flare.prefuse.org/

Loading Kits

• BulkLoader - A library for managing multiple loadings with Actionscript 3 (AS3).
  http://code.google.com/p/bulk-loader/
  
• Masapi
  http://code.google.com/p/masapi/
  
• QueueLoaderAS3
  http://code.google.com/p/queueloader-as3/
• SomaLoader
  http://www.soundstep.com/blog/downloads/somaloader/

OOP Frameworks

• Cairngorm
  http://opensource.adobe.com/wiki/display/cairngorm/Cairngorm
  
• PureMVC
  http://puremvc.org/
  
• Mate
  http://mate.asfusion.com/
  
• Gaia
  http://www.gaiaflashframework.com/
  
• Slide
  http://code.google.com/p/flex-slide/
  
• Guasax
  http://www.guasax.com/
  
• VEGAS
  http://code.google.com/p/vegas/
  
• Parsley
  http://www.spicefactory.org/parsley/
  
• LowRa - AS3 version of pixlib
  http://code.google.com/p/lowra/
• CASA Lib - An Open Source Code Library for ActionScript 2.0 & 3.0
  http://casalib.org/
• FlashMVC - A flexable lightweight framework engine for AS3
  http://www.flashmvc.com/

Other APIs and libraries

• facebook-actionscript-api - Actionscript API for the Facebook platform
  http://code.google.com/p/facebook-actionscript-api/
  
• as3facebooklib - ActionScript 3.0 API for Facebook
  http://code.google.com/p/as3facebooklib/
  
• Yahoo Maps API
  http://developer.yahoo.com/flash/maps/
  
• corelib - ActionScript 3.0 library for several basic utilities (JPEG Encoding, MD5 Hashing, JSON Serialization).
  http://code.google.com/p/as3corelib/
  
• as3flexunitlib - ActionScript 3.0 framework for unit testing.
  http://code.google.com/p/as3flexunitlib/
  
• as3flickrlib - ActionScript 3.0 API for Flickr
  http://code.google.com/p/as3flickrlib/
  
• as3mapprlib - ActionScript 3.0 API for Mappr
• http://code.google.com/p/as3mapprlib/
  
• as3syndicationlib - ActionScript 3.0 library for handling syndication feeds.
  http://code.google.com/p/as3syndicationlib/
  
• as3odeolib - ActionScript 3.0 API for Odeo
  http://code.google.com/p/as3odeolib/
  
• as3youtubelib - ActionScript 3.0 API for YouTube
  http://code.google.com/p/as3youtubelib/
  
• as3ebaylib - ActionScript 3.0 API for eBay
  http://code.google.com/p/as3ebaylib/
  
• as3awss3lib - ActionScript 3.0 library for interacting with Amazon S3
  http://code.google.com/p/as3awss3lib/
  
• as3soundeditorlib - Actionscript 3.0 library for sound playback, spectrum display, and cue point display
  http://code.google.com/p/as3soundeditorlib/
  
• as3ds - AS3 Data Structures For Game Developers
  http://code.google.com/p/as3ds/
  
• as3notificationlib - A notification framework written in AS3 for the Adobe Integrated Runtime (AIR)
  http://code.google.com/p/as3notificationlib/
  
• as3preferenceslib - An AIR library for storing preferences
  http://code.google.com/p/as3preferenceslib/
  
• as3nativealertlib - An AIR alert that appears in a native window
  http://code.google.com/p/as3nativealertlib/
  
• ASCOLLADA - actionscript library for parsing Collada files
  http://code.google.com/p/ascollada/
  
• FZip - An Actionscript 3 class library to load, modify and create standard ZIP archives.
  http://codeazur.com.br/lab/fzip/
  
• lastfm-as3 - Actionscript 3.0 API to access the Last.fm web services
  http://code.google.com/p/lastfm-as3/
  
• MapQuest
  http://company.mapquest.com/mqbs/4a.html
  
• Modest Maps - A display and interaction library for tile-based maps in Flash
  http://www.modestmaps.com/
  
• as3cards - An ActionScript 3.0 card engine and example games
  http://code.google.com/p/as3cards/
  
• flexircclient - ActionScript 3 based IRC library
  http://code.google.com/p/flexircclient/
  
• AsWing - A GUI framework and library that allows programmers to make their flash application(or RIA) UI easily.
  http://www.aswing.org/
  
• as3httpclient - ActionScript 3 utils/classes to extend HTTP/HTTPS APIs in Flash Player 9 (onwards)
  http://code.google.com/p/as3httpclient/
  
• DistortionTweener
  http://evolve.reintroducing.com/2007/11/18/as3/as3-distortiontweener/
  
• ascanvas - An adapter of HTML Canvas and fl.display.Graphics
  http://code.google.com/p/ascanvas/
  
• dopplr-as3 - actionscript 3 code for accessing data from dopplr.com’s api
  http://code.google.com/p/dopplr-as3/
  
• FC64 - an Open-Source Commodore 64 Emulator
  https://mirror1.cvsdude.com/trac/osflash/fc64/
  
• FFilmation - AS3 Isometric Engine
  http://www.ffilmation.org/website/
  
• Google Maps API
  http://code.google.com/apis/maps/documentation/flash/intro.html
  
• FVNC - VNC Client for Flash Player 9 and above
  http://osflash.org/fvnc
  
• AS3 Parametric Curve Library
  http://www.algorithmist.net/as3pc.html
  
• AWI - AMFPHP-WordPress Integration
  http://www.klr20mg.com/awi/ (in Spanish)
• as3webservice - Open-source Webservice class implementation in AS3 for Flash CS3 IDE
  http://code.google.com/p/as3webservice/
  
• as3jayrock - AS3 wrapper for Jayrock communication
  http://code.google.com/p/as3jayrock/
• ASAP Library - A library for the development of maintainable, multi-movie, interactive applications.
  http://asaplibrary.org/
• Wordpress XML-RPC API
  http://blog.absentdesign.com/?page_id=22