I am considering hippo
It need to have a debian/ubuntu friendly licence.
Thanks,
It all depends on your exact needs but without more details, I'd add Alfresco, Nuxeo and Exo to your list.
Hippo CMS is Apache licensed, so in that sense an option for you. If you want to get started, go to: http://www.onehippo.org/
I read that Liferay is one of the best open source Java-based portals. Also it's specifically designed be useful for enterprise use.
Also it's licensed under the MIT-License.