Collaborize Classroom is a free e-learning classroom for teachers and their students. It's a wonderful page easy to use, try it!

Wiggio is the easiest free way to host free virtual meetings and conference calls. You can also share calendars, assign tasks, send e-mail, text and voice messages, upload and manage files, etc. Wiggio makes it easy to work in groups! :)

Hello everyone! This Software empowers users to construct, navigate, share, and criticize knowledge models represented as Concept Maps. The toolkit is platform independent and network enabled, allowing the users to build, and collaborate during the construction of concept maps with colleagues anywhere on the network, as well as, share and navigate through others models distributed on servers throughout Internet