Interact is an Online Learning and Collaboration platform developed by the Christchurch College of Education, New Zealand. It is a free alternative to the likes of WebCT and Blackboard. It is an open source cms, lms designed with the intention of making it easy for students and lecturers to interact online, based around constructivist and vygotskian views of teaching and learning.
... http://cce-interact.sourceforge.net/