Wikimedia Commons

Tiki is a powerful multilingual wiki/content management (CMS)/groupware system, developed based on PHP, ADOdb and smarty. You can use Tiki to build and manage your wiki, file/picture library, Content management systems, blogs, tracking/forms, forums, directories, polls, surveys, quizzes, newsletters, calendars, FAQs, spreadsheets, maps, workflows and more.

Tikiwiki v8.0 beta includes many new features and functionality:

Several improvements to the tracker allowing for more flexible designs.
New filters have been added and the usability of the admin page has been improved.
Several improvements to the search architecture.
Upgraded template engine Smarty 2 to 3.
Completed the translation of the German interface.