BigBlueButton is an open source web conferencing system that enables universities and colleges to deliver a high-quality learning experience to remote students.
BigBlueButton supports sharing of slides (PDF and PPT), video, chat, voice (using Asterisk), and desktops. It's built using over fifteen open source components, runs on Mac, Unix, and PC computers, and is backed by an open source community that cares about good design and a streamlined user experience.
Source: BigBlueButton Demo, http://demo.bigbluebutton.org/
This module implements the BigBlueButton API .
It allows moderators to create new meetings and users to join meetings based on the role they have.
Beware: Both BigBlueButton and this module are still in development.
Development sponsored by erdfisch http://erdfisch.de