Description
Flex is a highly productive, free open source framework for building and maintaining expressive web applications that deploy consistently on all major browsers, desktops, and operating systems. While Flex applications can be built using only the free Flex SDK, developers can use Adobe® Flex® Builder™ 3 software to dramatically accelerate development

Requirements
FLEX BUILDER 3 FOR WINDOWS (STANDARD AND PROFESSIONAL) * Intel® Pentium® 4 processor * Microsoft® Windows® XP with Service Pack 2 or Windows Vista® Home (Premium or Basic), Business, or Ultimate * 1GB of RAM (2GB recommended) * 500MB of available hard-disk space (additional 500MB required for plug-in configuration) * Java™ Virtual Machine: Sun™ JRE 1.4.2, Sun JRE 1.5 (included), IBM® JRE 1.5, or Sun JRE 1.6 * Eclipse™ 3.2.2, 3.3 and 3.4 for plug-in configuration (Eclipse 3.3 recommended for Windows Vista) * Adobe® Flash® Player 9 software* Flex Builder 3 for Windows has also been tested to work with these specific products: * BEA Workshop 10.1 * IBM Rational Software Architect 7.0.0.3 (Eclipse 3.3 plug-in configuration only) FLEX BUILDER 3 FOR MAC OS (STANDARD AND PROFESSIONAL) * PowerPC® G4 1.25GHz or Intel processor * Mac OS X v10.4.7–10.4.10 or 10.5 * 1GB of RAM (2GB of RAM recommended) * 500MB of available hard-disk space * Java Virtual Machine: JRE 1.5 or JRE 1.6 from Apple. NOTE: Flex Builder 3.0.2 does not run with Java for Mac OS X 10.5 Update 1 / 64 bit Java SE 6 version 1.6.0_05. * Eclipse 3.2.2 , 3.3 and 3.4 (for plug-in configuration) * Adobe Flash Player 9 software* * New Adobe Flex® Builder™ 3 projects create applications that require users to have Adobe Flash Player 9 (9.0.124.0). You can change this requirement to an earlier version of Flash Player 9 in the Flex Compiler section of your project\'s properties.