There is a Packages.gz and Description.txt file at http://www.modularity.org/knoppix

This file gives a list of the Packages, files, descriptions, etc of the KNOPPIX_V3.1-2003-01-01-EN.iso

Also see the file packages.txt on any of the mirror for a brief description.
http://public.planetmirror.com/pub/knoppix/packages.txt

Have fun!!
Avid