Joomla is #5 in Top 11 Website CMS systems
Joomla is a free and open source content management system (CMS) for publishing content on the World Wide Web and intranets and a model–view–controller (MVC) Web application framework that can also be used independently.
Positions in ratings
#5 in Top 11 Website CMS systems
The best alternatives to Joomla are: Drupal, SharePoint, Alfresco, Liferay