Tiki uses a large number of Classes.

Net_NNTP
Tiki CVS

PEAR::Auth package
Tiki CVS

PEAR::Date
Tiki CVS

http://www.dithered.com/javascript/cookies/index.html
Tiki CVS

class htmlMimeMail
Tiki CVS

PhpConcept Library - Zip Module
Tiki CVS

class PHPlot
Tiki CVS

Class: Rdf_parser
Tiki CVS

overLIB JavaScript library
Tiki CVS

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Related links:
http://www.phpclasses.org/
http://pear.php.net/