Liferay Portal is an enterprise web platform for building business solutions that deliver immediate results and long-term value.
Proven real world performance with marquee clients across industries
Rapid innovation with customer-contributed sponsored development and new releases every 8 months
A strong community with roughly 4 million downloads and 350,000-500,000 worldwide deployments
Guaranteed SLAs up to 24/7/1 with regular service packs and a five-year EOSL policy
Named a Leader in Gartner's Magic Quadrant for Horizontal Portals.
Open Source version of Liferay is maybe fun to use, but really pain to deploy and develop. The Portlet API is too complicated and doesn't fit modern websites nor applications. Some solutions include using another framework for portlet implementation, e.g. grails-portlets plugin form Grails, but this introduces another problems: session sharing and authentication.... Web contents and ability to override every single default jsp page are great features, but you should expect more from mature CMS for Java. Community and documentation exist, but not very helpful in everyday use :( Enterprise version could be a better choice.