OpenUSS

The Open University Support System (OpenUSS) was designed as an open platform, which offers high level services for learning and teaching support including: personalised views for students and lecturers, e-mail based distribution lists, subject oriented discussion groups, moderated chat rooms, archiving for off-line support

The link address is:
http://www.campussource.de/org/software/openuss/

If you can read this text, it means you are not experiencing the Plone design at its best. Plone makes heavy use of CSS, which means it is accessible to any internet browser, but the design needs a standards-compliant browser to look like we intended it. Just so you know ;)