Pcwiki
From ProgClub
Pcwiki is the ProgClub Wiki software. It's a fork of MediaWiki 1.17.0, with a custom theme called OldSkool, and the NoTitle extension.
The code for pcwiki is publicly available from svn:
http://www.progclub.org/svnro/pcrepo/pcwiki/trunk
Or privately available for read-write access:
https://www.progclub.org/svn/pcrepo/pcwiki/trunk