Adobe Flex Builder for Linux (alpha 3) - April 2nd, 2008
We could read on official adobe site
This is the first release of Flex Builder to support Desktop Linux. This version is based on several features from Flex Builder 3 (codenamed “Moxie”). It includes project creation, code coloring, code hints, compilation, the Ajax Bridge, Find All References, and debugging. Not all Flex Builder 3 features are supported, so be sure to check out the release notes for a list of unsupported features.
Download: http://labs.adobe.com/downloads/flexbuilder_linux.html