TikiWiki

An open-source Content Management System, Tikiwiki also supports Groupware web application enabling websites and portals on the internet and on intranets and extranets. Known as one of the most feature-rich CMS software, Tikiwiki extends the customization of modules to the user with selectable skins/themes.

PhpWiki

PhpWiki is a web site where anyone can edit the pages through an HTML form. Linking is done automatically on the server side; all pages are stored in a database.