Foswiki is an Enterprise wiki, typically used to run a collaboration platform, knowledge base or document management system. Users can create wiki applications using the Topic Markup Language, and developers can extend its functionality with plugins. Foswiki stands for "Free and Open Source" wiki to emphasize its commitment to Open Source software.
Content Management System for web design ninjas, offers full design freedom without the constraints of limiting templates.
Risoluto - Simple Framework for PHP -
Risoluto is a framework for PHP. The concept is "simple and light weight". If you use a framework for the first time or looking for light weight one, Risoluto is good choice.
WikyBlog is a CMS/Groupware application written in PHP/MySQL that fuses collaborative editing features of wikis with user friendly publishing characteristics of blogs. MediaWiki derived wiki syntax, AJAX enhanced, UTF8 and extendable (google maps).