Liferay is a portal designed to deploy portlets that adhere to the Portlet API (JSR 168). Many useful portlets are bundled with the portal (Mail, Document Library, Calendar, Message Boards, etc)
...dedicated into Java open source projects
iPoint Portal Open Edition is a complete open source collaborative web portal.
iPoint comes with a complete set of portlets with which you can create fully featured portals, Internet sites and collaborative workspaces.
uPortal is an open-standard effort using Java, XML, JSP and J2EE. It is a collaborative development project with the effort shared among several of the JA-SIG member institutions.
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