mediawiki by mediawiki.org
Collaboration - Portal
Open source knowledgebase and content management system
MediaWiki is a Web-based wiki software application deployed by companies as an internal knowledge management solution, and as a content management system. MediaWiki is written in PHP, and can use either the MySQL or PostgreSQL relational database management system. MediaWiki supports more than 70 languages; it is scalable and customizable.
For more information, please visit the homepage of mediawiki at http://www.mediawiki.org/wiki/MediaWiki.
This application is freeware and can be installed with our hostings with a click of a button with no previous knowledge required.