DidiWiki (http://didiwiki.org/) is a small WikiWikiWeb implementation.
I found it first in Puppy-linux, and have used it for my personal notes.

It's small (Installed size 140kB, binary only 28kB) and usefull - an excellent candidate for Knoppix.

Homepage: http://didiwiki.org/
Debian-package: http://packages.debian.org/stable/web/didiwiki
License: GPL (mentioned in file /usr/share/doc/didiwiki/copyright)