Content Management Systems
A web content management system is a software content management system specifically for web content. It provides website authoring, collaboration, and administration tools that help users with little knowledge of web programming languages or markup languages create and manage website content.
Drupal
Drupal is a free and open-source web content management system written in PHP and distributed under the GNU General Public License.
Joomla
Joomla, also spelled Joomla! and sometimes abbreviated as J!, is a free and open-source content management system for publishing web content on websites. Web content applications include discussion forums, photo galleries, e-Commerce and user communities and numerous other web-based applications.
WordPress
WordPress is a free and open-source content management system written in hypertext preprocessor language and paired with a MySQL or MariaDB database with supported HTTPS. Features include a plugin architecture and a template system, referred to within WordPress as “Themes”.