Joomla! is a 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 popular Web site software available.
Best of all, Joomla! is an open source solution that is freely available to everyone.
Joomla! feature list:
* Account management
* Content Management
* Authentication using LDAP or OpenID
* Pluggable components (plug-ins).
* Module development using Model-View-Controller development model.
* Blogs, Newsfeeds and online polls
* Support for Language Internationalization
For documentation and other information on Joomla: Visit Joomla! Here