Drupal

Is a content management system (CMS) multipurpose modular and highly configurable to publish articles, images, or other files and added services like forums, surveys, polls, blogs and user management and permissions.

Joomla

Is a content management system (CMS) that enables the management and development of interactive pages and its main virtues to edit the content of a website easily. Includes a wide variety of modules, themes, plugins and extensions.

Moodle

It is a virtual learning environment and course management system of free distribution, which helps educators create online learning communities. This type of technology platforms is also known as LMS (Learning Management System).