Blackboard Inc. (Popularity: )
http://www.blackboard.com Provider of products that enable universities, schools, and corporations to host their classes on the World Wide Web.
Desknow (Popularity: )
http://www.desknow.com Open platform for internet-based collaboration services, accessible from PC and mobile devices.
iCohere, Inc. (Popularity: )
http://www.icohere.com Provides collaboration software, groupware and knowledge management tools to create communities of practice, build learning communities, and deliver online.
Limu Solutions (Popularity: )
http://www.limusolutions.com/ Live web-based learning with integrated content management system. Ultra thin client requires no software installation.