Software
Here are some links to (free) software
this list will be updated:
Sound
If you are using Linux check out CCRMA. They are developing and distributing tons of stuff (in a project called Planet CCRMA).
Also check out the programs developed by NOTAM.
Ardour - Linux and OSX freeware multi-track editor – a UNIX-version of protools.
Audacity - cross-platform open source multi-track sound editor
Hyperupic - image to sound translation for OSX
IXI - somewhere in between real-time processing and soundtoys
Pure data (or Pd) – cross-platform open source modular program in the max-family
Pd libraries:
Gem - GEM (Graphical Environment for Mulitmedia) is a library for working with real-time 3D graphics
Pmpd - excellent library for physical modelling
Soundhack - Tom Erbe’s classic FFT based sound-editor (OSX)
Mulitmedia
Eyesweb - excellent (windows only) modular program for real-time video processing and analysing.
Processing - cross platform tool for writing digital multimedia application