Arno Hollosi wrote the MySQL library, the templates, and wrote the 
finished version of the database schema, plus many other things too
numerous to mention.

Jeff Dairiki <dairiki@dairiki.org> wrote the diff code, among other
things.

Jeremie Kass <jeremie@umich.edu> contributed a patch so the logo is 
decided in the templates instead of being hardcoded.

In the 1.0 series:

John Jorgensen http://c2.com/cgi-bin/wiki?AnotherPhpWiki,
Tim Voght http://c2.com/cgi-bin/wiki?TimVoght,
Grant Morgan http://c2.com/cgi-bin/wiki?GrantMorgan,

and especially Clifford A. Adams:
http://c2.com/cgi-bin/wiki?CliffordAdams

who gave invaluable feedback and patches to my little project!