Another Moodle ???

Sakai is an open source Collaboration and Learning Environment (CLE) that I hadn't heard of before. It seems to have some big supporters though. Here's what the website says:
"The Sakai Project has its origins at the University of Michigan and Indiana University, where both universities independently began open source efforts to replicate and enhance the functionality of their existing CMSs . Soon after, MIT and Stanford joined in and, along with the Open Knowledge Initiaitive (OKI) and the uPortal consoritum, and a generous grant from the Mellon Foundation, they formed the Sakai Project."

http://sakaiproject.org/