SonicBirth:





SonicBirth is an AudioUnit designing application. The first in its category, it allows users to build their own AudioUnit plugins, either by working with existing circuits or by creating circuits completely from scratch. SonicBirth is also a free AudioUnits package, as it comes bundled with a set of plugins designed for standalone use as plugins as well as pre-constructed circuits to modify or build upon for creating new plugins. Whether you're looking for traditional eqs, compressors, and reverbs, or softsynths, distortion, and filters, etc., SonicBirth allows you unprecedented freedom and creativity over your sound.

so, in a sense it's somewhat like maxmsp/reaktor, only completely free. this is for the users that wanna experiment with creating their very own unique AU's for use.

i'm sure theres some that know of it, but this is for those who don't so, enjoy!

http://sonicbirth.sourceforge.net/download.shtml