Documentation Flex

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http://www.adobe.com/products/flex.html Flex is a powerful, open source application framework that allows you to easily build mobile applications for iOS, Android™, and BlackBerry® Tablet OS devices, as well as traditional applications for browser and desktop using the same programming model, tool, and codebase.

Labs - Adobe Adobe Flex 4 SDK

It is with great pleasure that we can announce that Flex 4 and Flash Builder 4 have shipped! Both releases contain a wealth of new features and workflows that allow developers to develop in an efficient and intuitive manner.

Forums: Forum: Flash Builder and Flex SDK

http://forums.adobe.com/community/flex/flex4beta
http://opensource.adobe.com/wiki/display/flexsdk/Flex+SDK

Flex SDK - Flex SDK - Confluence

Overview Flex is a highly productive, open source framework for building and maintaining expressive web applications that deploy consistently on all major browsers, desktops and operating systems.
by Deepa Subramaniam Flex 4 will be applicable to a much wider range of tasks and people. As we work to fulfill one of the three major themes for Flex 4, Design in Mind , we will provide a framework that allows developers and designers to work seamlessly together in an unfettered environment to create rich content previously unseen in Flex applications. http://opensource.adobe.com/wiki/display/flexsdk/Gumbo+Component+Architecture

Gumbo Component Architecture - Flex SDK - Confluence