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, this also means that you can modify the source code according to your needs and gain maximum advantage.
Liferay Portal is a free and open source enterprise portal software product. Distributed under the GNU Lesser General Public License and optional commercial license. It is primarily used to power corporate intranets and extranets.
Liferay is sometimes described as a content management framework or a web application framework. Liferay’s support for plugins extends into multiple programming languages.