dimdim

Dimdim is a free web conferencing service where you can share your desktop, show slides, collaborate, chat, talk and broadcast via webcam with absolutely no download required to host or attend meetings.

Dimdim’s built-in VoIP capability is a godsend to customers with limited access to quality phone service, providing free calling to and from any computer with a microphone and an Internet connection.

Homepage: http://www.dimdim.com