PhpWiki is a WikiWikiWeb clone in PHP. A WikiWikiWeb is a site where anyone can edit the pages through an HTML form. Multiple storage backends, dynamic hyperlinking, themeable, scriptable by plugins, full authentication, ACL's.
Yet Another Wiki Wiki is a WikiWiki clone requiring only PHP. Written to be useable as library (easy to encapsulate), it has been inspired on PHPWiki and QwikiWiki. It is meant to build easily complex websites with minimum effort.
WikiChump is a perlbot plugin that listens in an IRC channel for URLs and posts them to a specified wiki page. Currently it only works with phpWiki. It allows for the titling and commenting of the captured URLs. The wiki provides a RSS feed.
Bethelite is a content management system based on version
release-1_2-branch of the PhpWiki application. Bethelite adds user management, site management, and access levels.