Liferay Portal has become the leading open source portal in today's market. Liferay Portal takes advantage of the most recent technologies (Java, J2EE, Web 2.0) and has out of the box all of the features you need to run a successful web site, whether that site is a public Internet site, a corporate Intranet, or anything in between.

Features

• Runs on all major application servers and servlet containers, databases, and operating
  systems, with over 700 deployment combinations
• JSR-286 Compliant
• Built in Content Management System (CMS) and Collaboration Suite
• Out-of-the-box usability with over 60 portlets pre-bundled
• Benchmarked as among the most secure portal platforms using LogicLibrary's Logiscan suite.

Liferay Portal offers a rich user interface constructed with Ajax technology that provides dynamic, intuitive and time saving features that foster user adoption across your entire organization. Liferay Portal is the first to introduce drag-and-drop portlet re-positioning and provide users a way of formatting their messages without allowing them to enter HTML! Changes and adjustments in the interface can take place with just a simple click without having to touch any code through a hot-deployable architecture.

Furthermore, Liferay can provide free-form portlets through WebOS, which mimics the look and feel of
your desktop environment. Its content-oriented assistance is obvious. It supports WebDAV filesystem, both for Windows and Linux, increasing the performance by using familiar-to-users folders. Also, portlets are installed immediately and independently without the need to reload the whole web page.