Joomla!

click here to visit the Joomla! home page
Joomla! Is an open source content management system platform for publishing content on the World Wide Web and intranets as well as a Model–view–controller (MVC) Web application framework. It is written in PHP, stores data in MySQL and includes features such as page caching, RSS feeds, printable versions of pages, news flashes, blogs, polls
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WordPress

click here to visit the WordPress home page
Wordpress is an open source blog publishing application powered by PHP and MySQL which can also be used for content management. It has many features including a plugin
architecture and a templating system.
Used by over 2% of the 10,000 biggest websites, WordPress is the most popular blog software in use today.
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Drupal

click here to visit the Drupal home page
Drupal is a free and open source, content management system (CMS) written in PHP and distributed under the GNU General Public License. It is used as a back-end system for many different types of websites, ranging from small personal blogs to large corporate and political sites, including whitehouse.gov and data.gov.uk. It is also used for knowledge
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