CONTENT MANAGEMENT SYSTEM
Joomla is a free and open-source content management system (CMS) for publishing web content. It is built on a model–view–controller web application framework.
Drupal is free, open source software that can be used by individuals or groups of users to easily create and manage many types of Web sites.
OpenCms is an open source content management system written in Java. It requires a JSP Servlet container such as Apache Tomcat.
WordPress is an online, open source website creation tool written in PHP. It's most powerful blogging and website content management system.