.LRN

.LRN provides a comprehensive suite of collaboration tools, a flexible toolset for innovation, and an enterprise-class infrastructure for scalable deployment. Its underlying architecture is based on a highly-scalable community framework that 's ideally suited to support teaching, research, and administration .LRN allows users and administrators to define different kind of communities, where each community can be equipped with different tools and resources for shared work, dialogue, and investigation.

Homepage: http://dotlrn.openacs.org/product/