Liferay Portal is an open source enterprise portal primarily used to power corporate intranets and extranets. It combines features of content management system (web content, documents, multimedia files) and corporate work organization (calendar, wiki, forums, blogs, messenger).
Many available extensions or plugins available. Custom programming may not be necessary.
User-friendly and easy to use, and offers easy management of content and data, with a minimal learning curve. No prommaning knowledge is necessary.
Has a larger active community. Support is always available for free or as a paid service. Excellent documentation available.