Flex is a highly productive, free open source framework for building andmaintaining expressive web applications that deploy consistently on allmajor browsers, desktops, and operating systems. While Flex applicationscan be built using only the free Flex SDK, developers can use AdobeFlex Builder 3 software to dramatically accelerate development. TryFlex Builder 3 free for 60 days. Rich Internet applications created with Flex can run in the browserusing the ubiquitous Adobe Flash Player software or on the desktop onAdobe AIR. This enables Flex applications to run consistently acrossall major browsers and across operating systems on the desktop. Andusing Adobe AIR, the cross-operating system runtime, Flex applicationscan now access local data and system resources on the desktop.