(Tiki)Wiki

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http://www.ohloh.net/p/tikiwiki A full-featured, web-based, multilingual (40+ languages), tightly integrated, all-in-one Wiki+CMS+Groupware, Free Source Software (GNU/LGPL), using PHP, MySQL, Zend Framework, jQuery and Smarty. Tiki can be used to create all kinds of Web applications, sites, portals, knowledge base, intranets, and extranets. It is actively developed by a very large international community. Tiki is the FOSS Web Application with the most built-in features. Highly configurable and modular, all features are optional and administered via a web-based interface. <p style="text-align:right;color:#A8A8A8"></p>

Tiki Wiki CMS Groupware

http://info.tiki.org/Download

Tiki Wiki CMS Groupware

DEV - the cutting edge daily build Beauty is only skin deep, right? With Tiki's use of CSS and Smarty templates , creating custom skins (or themes ) is easy. If you see an especially good looking Tiki, be sure to nominate it to be a featured Tiki site . The standard Tiki install includes several themes (or skins ).
http://www.dokuwiki.org/dokuwiki

DokuWiki]

DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database. It is loved by users for its clean and readable syntax . The ease of maintenance, backup and integration makes it an administrator's favorite. Built in access controls and authentication connectors make DokuWiki especially useful in the enterprise context and the large number of plugins contributed by its vibrant community allow for a broad range of use cases beyond a traditional wiki. Get started: