CVW - Collaborative Virtual Workspace

CVW is a collaboration software environment that provides a "virtual building" where teams can communicate, collaborate, and share information, regardless of their geographic location. CVW takes virtual meetings one step further and enables virtual co-location through persistent virtual rooms, each incorporating people, information, and tools appropriate to a task, operation, or service. To learn more about CVW:
http://cvw.sourceforge.net/cvw/info/CVWOverview.php3

Userful information on Collaborative Tool Kit
http://www.web-enable.com/industry/collabarativetools.asp