JBoss Portal
JBoss Portal is an open source portal released by RedHat. It integrates with JBoss application server and can work with Jboss cache and Hibernate at the backend. JBoss Portal supports single sign on, JAAS authentication, cacheing, clustering and hot deployment.
In JBoss, multiple portal instances can run in the same portlet container. Also interportlet communication, internationalization, user/group functionality are supported out of the box.
JBoss Portal is compliant to JSR-168, JSR-170, JSR-252, and J2EE 1.4.