NetOffice is another CMS, and OpenSourceCMS rates it at a 4.32, which is pretty good. It's got some great features for working in groups, like Gantt charts, full support for the iCal format(so Sunbird can import), and the usual panoply of checkpoint and people tracking stuff. The only problem is, some people on the forums have been asking if the project is dead, and there's not really a definitive answer. Still, it looks like a promising project, and possibly useful if you're needing a groupware-oriented CMS.