BigBlueButton supports sharing of slides (PDF and PPT), video, whiteboard, chat, voice (using Asterisk or FreeSWITCH), and desktops. It's built using over fifteen open source components, runs on Mac, Unix, and PC computers, and is supported by a community that cares about good design and a streamlined user experience.
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BigBlueButton is an open source web conferencing system that enables universities and colleges to deliver a high-quality learning experience to remote students.
See examples of how you can integrate BigBlueButton into your applications.