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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 ... [More]
MoinMoin is an advanced, easy to use and extensible WikiEngine with a large community of users. Said in a few words, it is about collaboration on easily editable web pages. It is implemented in Python, plugins can also be written in Python. Python is a clean, powerful and easy to read programming language.
Foswiki is the next generation of enterprise collaboration suites. With Foswiki, you don't have to be a programmer to collect, store, and re-use enterprise information: everyday users have the power to easily create Web 2.0 applications such as mashups and social interaction tools.
Completely customizable, CakePHP based project management system for firms, their teams and their clients. A project management system that will suit your needs because it is module based, so it can grow and shrink with your requirements. Version 0.4 beta was released March 23, 2009.