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BigBlueButton is an open source web conferencing system for on-line learning.
BigBlueButton enables you share documents (PDF and any office document), webcams, chat, audio, and your desktop. BigBlueButton can also record your sessions for later playback.
The BigBlueButton project is supported by a community of developers that care about good design and a streamlined user experience.
See API examples for how to integrate BigBlueButton with your applications.