"If I tried to write this application in C, it would take five times longer just to get it to work on Windows and then I'd have to do it for Macintosh. With Adobe Flex and Adobe AIR, we're saving months of development time."

- Chris Hughes

Flex

adobe_flex Adobe Flex is a software development kit (SDK) released by Adobe Systems for the development and deployment of cross-platform rich Internet applications based on the Adobe Flash platform. Flex applications can be written using Adobe Flash Builder or by using the freely available Flex compiler from Adobe.
adobe_air Adobe Integrated Runtime, also known as Adobe AIR, is a cross-platform runtime environment developed by Adobe Systems for building Rich Internet Applications (RIA) using Adobe Flash, Adobe Flex, HTML, and Ajax, that can be run as desktop applications.