http://c2.com/cgi/wiki?WikiEngines lists many wikis including those which are written in Perl. In my company we use TWiki to maintain documentation and for project managment (using heavily patched XpTrackerPlugin).

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Ilya Martynov, ilya@iponweb.net
CTO IPonWEB (UK) Ltd
Quality Perl Programming and Unix Support UK managed @ offshore prices - http://www.iponweb.net
Personal website - http://martynov.org