Processing- good, simple, and pretty programming environment based on java for generating fractals and modeling some behaviors

http://processing.org/

Pure Data- excellent tool for sound synthesis and data analysis. Can also be used for 2D and 3D visual modeling.

http://puredata.info/

eMotion- a combination of tools that I usually build in Processing and the interface is sort of similar to the Soda Constructor (only available for Mac 10.5)

http://www.adrienm.net/emotion/eMotion.html

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