开发过程中使用API可以节省时间，这里有几十个API，它们可以在Flex, Flash和AIR中使用。
Adobe APIs
corelib, mappr, flickr, youtube and more.
http://labs.adobe.com/wiki/index.php/ActionScript_3:resources:apis:libraries
APE (ActionScript 物理引擎)
http://www.cove.org/ape/
as3awss3lib
与Amazon S3互动的AS3库
http://code.google.com/p/as3awss3lib/
as3soundeditorlib
Actionscript 3.0 library for 音频编辑
http://code.google.com/p/as3soundeditorlib/
ArcGIS API for Flex
The ArcGIS API for Flex allows the creation of RIA on top of ArcGIS Server. 基于免费开源的Adobe Flex. 支持Flex 3.x SDK.
http://resources.esri.com/arcgisserver/apis/flex/
asaudio
ASaudio是一个小的AS3库， 专注于简单有效的音频处理.
http://code.google.com/p/asaudio/
as3ansi
解析和显示扩展的ASCII (IBM code page 437) into AS3 for use in Flash and Flex applications.
http://code.google.com/p/as3ansi/
ActionScript 3.0 Client Library for Facebook Platform API
Facebook平台新的ActionScript 3.0库, 被Facebook和Adobe充分支持, 使Flash平台与Facebook平台强强联合变得简单
http://code.google.com/p/facebook-actionscript-api/
ascolourlovers
ColourLovers API for ActionScript 3. This library provides all the tools needed to bring palettes, colors, patterns and more from the ColourLovers API in your AS3 projects.
http://code.google.com/p/ascolourlovers/
AS3DAC
AS3DAC parses an AS3.0 class or instance file and adds asdoc documentation stubs. 遵循Flex SDK合适的编码规范.
http://code.google.com/p/as3dac/
as3flexdb
AS3FlexDB 项目使 Adobe Flex 程序连接MySQL服务器.
http://code.google.com/p/as3flexdb/
as3growl
An ActionScript 3 API for working with the Growl notification service.
http://code.google.com/p/as3growl/
AS3 Http Client Library
An http library written on top of flash.net.Socket (and as3crypto) to be used with AIR or flash runtimes.
http://github.com/gabriel/as3httpclient
as3midilib
MIDI for ActionScript 3.0
http://code.google.com/p/as3midilib/
as3openxmlformats
ActionScript 3 lib for MS Office Open XML Formats (Word 2007, Excel 2007 and PowerPoint 2007 on AIR)
http://code.google.com/p/as3openxmlformats/
as3-scaffold
as3-scaffold is a lightweight as3 framework with an accompanying set of scaffolding scripts to automate the tedium of setting up new as3 projects, with support for PureMVC.
http://code.google.com/p/as3-scaffold/
as3scriptinglib
其目标是提供一个API为运行时在flash中编译和执行ActionScript/JavaScript (no server required) via Adobe’s ECMAScript 4 compiler (from the Tamarin project).
http://code.google.com/p/as3scriptinglib/
as3zlib
as3 port of zlib
This is a port of JZlib to as3. Was created because as3 in Flash9 does not support deflate in ByteArray. AIR does support deflate and doesn’t need this code.
http://code.google.com/p/as3zlib/
bitly as3 api
Simple as3 implementation for bit.ly API.
http://code.google.com/p/bitly-as3-api/
Diggbe
Diggbe是依赖注入引擎. It is first conceived for unit testing purposes (to avoid xxxSet/GetForTest). But it can also be use for runtime code to allow service dependencies to be injected.
http://code.google.com/p/diggbe/
echo-nest-flash-api
An ActionScript 3 interface for the the Echo Nest API.
http://github.com/also/echo-nest-flash-api
Etsy API Wrapper for Actionscript 3
An Actionscript 3 class that wraps the Etsy.com API.
http://thunderfarm.com/etsy/
feedmeas3
FeedMe is a low level class for sharing data between objects.
http://code.google.com/p/feedmeas3/
fuelas3svn
SVN协议的AS3实现 . 你可以完全使用Flash平台制作自己的SVN客户端.
http://code.google.com/p/fuelas3svn/
Gigya AS3 API
http://wiki.gigya.com/030_Gigya_Socialize_API_2.0/030_API_reference/010_Client_API_%28JavaScript%29
googleas3api
AS3 library on Googles API’s, 在你的 Flash/Flex/AIR 程序中集成Google的应用 (searches, translation, suggest, weather, feeds).
http://code.google.com/p/googleas3api/
Kongregate’s AS3 API
The Kongregate AS3 API allows you to extend your game to communicate with the Kongregate back-end.
http://www.kongregate.com/developer_center/docs/as3-api
KoolMoves AS3 API
http://koolexchange.com/docs/km/
lastfm as3
Actionscript 3.0 API to access the Last.fm web services.
http://code.google.com/p/lastfm-as3/
Mappy AS3 API
Thanks to Mappy AS3 API, show your users advanced visual effects (zooming with transition effects, video integrations, animations, etc.)and render maps quickly on browsers with a Flash plug-in instaled (the vast majority of Internet users).
http://api.mappy.com/en/as3
MP3tunes Music AS3/Flex/AIR API
API to implements the MP3tunes Music API. The api consists of REST interface which gives you access to all data for a user within the MP3tunes Locker service. It gives you the foundation for using the service in a AS3/Flex/AIR project.
http://code.google.com/p/mp3tunes-as3-api/
nd3d
ND3D 是简单的AS3 3D 引擎. 目的是迅速简单. Target use are small 3D effects and rapid 3D testing / prototyping. 编译后只有10k.
http://code.google.com/p/nd3d/
netflex-as3-api
An Actionscript 3 utility library to simplify the Netflix API for Actionscript 3 based applications.
http://code.google.com/p/netflex-as3-api/
Sekati API
Sekati API is a Pure Actionscript 3.0 framework designed to bootstrap the development of flash/flex projects & applications with an emphasis on high-level functionality encapsulation. The framework provides a flexible, feature-rich xml configurable application architecture through the implementation of it’s collection of behavior-specific core display objects, controllers, managers & utilities.
http://code.google.com/p/sekati/
Soundcloud AS3 API
Universal Soundcloud API wrapper for Flash, Flex and AIR projects, written in ActionScript 3.0.
http://github.com/dasflash/Soundcloud-AS3-API/blame/1aa2d25c072309a1e931b08e88f6c7218a135be0/README
tweensy
Tweensy is an extremely efficient Actionscript 3 property tweener. Contained within Tweensy is an expansion package called Tweensy FX which allows for motion effects to be applied onto DisplayObjects.
http://code.google.com/p/tweensy/
vyana
Light-weight Cairngorm-PureMVC like framework with care about modular applications
http://code.google.com/p/vyana/
wiiflash
Communication between the Wiimote and Flash
http://code.google.com/p/wiiflash/
as3ds
AS3 Data Structures For Game Developers
http://code.google.com/p/as3ds/
ASCOLLADA
http://code.google.com/p/ascollada/
As3Crypto
ActionScript 3 密码库
http://crypto.hurlant.com/
asinmotion
Animation Library for AS3
http://code.google.com/p/asinmotion/
Away3d
http://code.google.com/p/away3d/
ebay API
http://code.google.com/p/as3ebaylib/
facebook-as3
AS3 API to access Facebook’s Platform API
http://code.google.com/p/facebook-as3/
flest
Flest Framework for Adobe Flex and ActionScript3 Applications
http://code.google.com/p/flest/
FZip
Actionscript 3 class library to 加载标准ZIP文件并解压缩出包含的内容.
http://codeazur.com.br/lab/fzip/
MapQuest
http://company.mapquest.com/mqbs/4a.html
mecheye-as3-libraries
A set of ActionScript 3 Libraries, primarily for Flash game development.
http://code.google.com/p/mecheye-as3-libraries/
Papervision3D
http://code.google.com/p/papervision3d/
Salesforce Flex Toolkit
http://wiki.apexdevnet.com/index.php/Flex_Toolkit
Tweener
Full featured animation library
http://code.google.com/p/tweener/
Twitter AS3 API
http://twitter.com/blog/2006/10/twitter-api-for-flash-developers.html
uicomponents-as3
Lightweight AS3 UI component library
http://code.google.com/p/uicomponents-as3/
XIFF
XMPP client library
http://svn.igniterealtime.org/svn/repos/xiff/branches/xiff_as3_flexlib_beta1/
Yahoo AS3 APIs
http://developer.yahoo.com/flash/as3_api_libraries.html