Dimdim - OSS Web Conferencing solution

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 for attendees. The Dimdim Web Meeting service is available in open source and commercial enterprise editions capable of supporting thousands of attendees. And unlike all other web meeting solutions, Dimdim is available in both onsite (you install it on your servers) and hosted (we install it on ours) configurations.