As an alternative to MS SharePoint we are using internally, and assorted standalone wiki installations (snipsnap, friki, xwiki, tikiwiki), I have been looking for the open-source Java portal/CMS frameworks with the following features (these are must-have):
- mature forums engine (moderators, topic hierarchies, searcheable) - knowledgebase (wiki-like with support for versioning, comments, searcheable)
It would be nice if both of the above were integrated - single sign-on against LDAP or SiteMinder or NTLM, search across both content repositories.
In addition it would be nice to have standards support (JSR168, JAAS, J2EE, JSF, WSRP, etc), ability to run on multiple DB backends.
So far the closest is Nukes on JBoss that despite all of its shortcomings (no JAAS, no JSR168, dependence on JBoss) has the features I need (with the exclusion of single sign-on).