Liferay Portal is a free and open source enterprise portal written in Java and
distributed under the GNU Lesser General Public License and proprietary licenses.
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 Portal is Java-based and runs on any computing platform capable of running the Java Runtime Environment
and an application server. Liferay is available bundled with a servlet container such as Apache Tomcat.
Liferay is built using the most popular Enterprise Java development stack these days,
which is Spring on Hibernate. The web side of it uses JSPs and the Struts framework,
which is from the days when Struts was the de facto Java web framework.
is built on the Yahoo YUI user interface library.
Liferay has the lowest Total Cost of Ownership (TCO) compared to its competitors starting with its licensing and getting it up and running through development costs, operational costs, and training/support costs (from the perspective of infrastructure, developers, administrators, and end users).
Liferay offers you a full choice of application servers, databases, and operating systems to run on, thereby allowing you to leverage your infrastructure and skills investment.