Open source webcasting?

SPARC is looking for some open source webcasting software to replace the proprietary software they are currently using, Infinite Conferencing. The crucial functionality they need is:
(1) Slide delivery – They need to be able to conduct a powerpoint/slideshow presentation over the web in a user-friendly manner, without having to download any plugins. I am unclear on how Infinite does this, Jennifer suggested that it might be ActiveX, but that would only work on Windows/IE and she also claims to have used it on a Mac, so that can’t be right.
(2) Text chat – IRC + web portals should be good enough to handle this?
If we could do those two things in an open source fashion, they could just a conference call on a phone line to handle the audio portion, and ditch the proprietary software. Of course, it would be nice to handle that and other things online as well, so other useful features would include:
* Group VOIP chat / online conference calls
* Video option
* reliable
* easy to install + use.

Any ideas folks? C’mon lazyweb, I’m counting on you ๐Ÿ˜‰

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