http://win32.perl.org/wiki/index.php?title=Main_Page uses PHP-based MediaWiki
http://www.perlfoundation.org/perl5/index.cgi uses SocialText
http://usemod.com/cgi-bin/mb.pl?action=browse&id=WikiEngine&oldid=WikiEngines doesn't mention MojoMojo
http://wiki.movabletype.org/?title=Talk:Main_Page&action=history uses MediaWiki
http://perl.net.au/wiki - uses MediaWiki
http://wiki.cpantesters.org/wiki/HomePage - uses "Labyrinth"

Comments (4)
Added MojoMojo's features to http://c2.com/cgi/wiki?WikiChoicetree. Most were filled, except (meanings are not clearly described there):
Flat-file storage
Wikipedia-style markup (known by the largest number of users)
Quick change (without needing to EditPage)
Subscription for e-mail notification of recent changes
WikiWhiteboard
Renaming nodes optionally renames references to that node
Editing individual sections of a page (SectionEditing)
Polls & votes
Spreadsheet calculations
Charts and Graphs
Web-based presentation/Slideshow
Mindmapping support
Not sure about:
Fully functional on portable device(s)
Installation on hosted servers
PMzLAG http://jfkIj4nC01mcKkavYstU3l.net
PMzLAG http://jfkIj4nC01mcKkavYstU3l.net
PMzLAG http://jfkIj4nC01mcKkavYstU3l.net