http://labs.adobe.com/technologies/flex/flexbuilder_linux/

Update: Flex Builder Linux alpha 3 was released on 3/31/2008. Please download alpha 3.

Welcome to the Adobe® Flex™ Builder™ Linux alpha on Adobe Labs. Flex Builder Linux is a plugin-only version of the Flex Builder that you can use to build Flex applications on Linux. We wanted to get an early release out with the base Flex Builder features so you could begin to provide us with your feedback and let us know your priorities for additional features.