Thousands of feature rich, tested extensions for e-commerce, events, maps, blogging, user forums, and much more.  Making a website, with each part created and tested by experts in each field,  you can have the web site of your dreams with no license fees running in days! "Joomla!® is an award-winning content management system (CMS), which enables you to build Web sites and powerful online applications. Many aspects, including its ease-of-use and extensibility, have made Joomla!® the most popular Web site software available. Best of all, Joomla!® is an open source solution that is freely available to everyone. "  Joomla.org