Seeking a web conferencing system (like WebEx) for Linux

Does anyone know of a Linux (GPL/Open Source) with capabilities similar to WebEx (http://try.webex.com/mk/get/services_conferencing-overview?TrackID=1000269)?

I.e. 
    Interactive online meetings with both Video and Audio.

I'm looking primarily for the server function. I assume the client function will also exist.

Thanks,

George
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