We use the Joomla! open-source Content Management System (CMS) for our work. There are a number of such systems, but the Big Three are WordPress, Joomla and Drupal. Which is the best is generally a tug of war between those three. The website CMSCritic.com just awarded Joomla is award for Best Free CMS for 2015. Three cheers for the entire Joomla ecosystem!