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Joomla! is a free open source content management system for publishing content on the World Wide Web and intranets. 

The system includes features such as page caching to improve performance, RSS feeds, printable versions of pages, news flashes, blogs, polls, website searching, and language internationalization. Joomla is licensed under the GPL, and is the result of a fork of Mambo.

  It is written in the PHP programming language and uses the MySQL database by default.