purplemass.com

http://osflash.org/red5

Also, Check Adobe Open Sources Parts Of Flex Platform

Processing is a context for exploring the emerging conceptual space enabled by electronic media.

It is an environment for learning the fundamentals of computer programming within the context of the electronic arts and it is an electronic sketchbook for developing ideas.

Check their website: proce55ing.net or processing.org

Proce55ing tutorial for macromedia minds:

http://jtnimoy.com/itp/p5/workshop/

Here’s an ex-collegue talking about Processing:

http://www.youtube.com/watch?v=sDeT6RPstbI

Courtesy of xkcd