Free and Shareware for multi-media production (2/04):

Music/Sound:

Audacity - free audio editor

http://audacity.sourceforge.net/
windows: http://audacity.sourceforge.net/windows.php
mac: http://audacity.sourceforge.net/mac.php

Pure Data - free max-like environment, Miller Puckett

software: http://www.crca.ucsd.edu/~msp/software.html

documentation: http://crca.ucsd.edu/~msp/Pd_documentation/

Supercollider - A real time audio synthesis programming language, James McCartney

http://www.audiosynth.com/

Tom Erbe's list of audio processing software for Macintosh including "Soundhack," CalArts School of Music

http://shoko.calarts.edu/%7Etre/CompMusMac/

Plogue Bidule: free interactive music environment:

http://www.plogue.com/bidule/

ixi experimental audio software

http://www.ixi-software.net/content/software.htm

Windows and mac VST sound processing plugins:

http://audacity.sourceforge.net/plugins.php
http://www.kvr-vst.com/

OSX MIDI Monitor

Finale notepad - music notation:

http://www.finalemusic.com/notepad/

Video editing:

Avid free DV

http://www.avid.com/freedv/features.asp

Digital Imaging:

GIMP, GNU Image Manipulation Program:

for mac
http://www.macgimp.org/
for windows, etc:
http://www.gimp.org/

Open Source software

http://sourceforge.net/