Joomla is a widely used CMS.
Hundreds of developers have been improving Joomla! since the first version was released in 2005. This immense effort has made Joomla! very popular, easy to use, stable and secure.
Joomla! has thousands of free extensions and templates allowing you to customize your site to fit your specific needs.
More information can be found at: https://www.joomla.org/