CURE provides a web-based environment for distributed collaboration. It was designed for lerning groups but is now also used to support busines collaboration. It combines wiki ideas with mailing lists, shared folders, chats, and room metaphors.
Dithaka is a dynamic mailing list and collaboration engine written in Java. It merges the concepts of mailing list and web forum; every message sent to the list appears as a post in the forum, and every post to the forum generates a message to the list