Joomla! Joomla! is a free, open-source content management system (CMS), for publishing web content. Joomla! has been around for many years. Joomla! has won many awards over the years. It uses a model view and controller web application framework, which can be used separately from the CMS to allow you to create powerful online applications. Joomla! Joomla! is a popular website software because of its global community of volunteers and developers who ensure that the platform is user-friendly, extensible, multilingual, accessible and responsive, search engine optimized, and much more. A CMS is a web-based application that allows multiple users to manage the content, data, and information of a website project or intranet application. Content management refers to the creation, editing, archiving and publishing of website content, data and information.