The document discusses open source content management systems (CMS). It defines a CMS as a software tool installed on a web server that enables easy management of a site's content, features, and users through a browser-based interface. It then discusses some of the top open source CMS options - WordPress, Joomla, and Drupal - outlining their pros, cons, typical uses, and differences. The document stresses that the best CMS depends on an organization's specific needs and resources, and provides tips for evaluating options and calculating the total cost of ownership.