Muti-Platform VoiP Conference service?

Hi all,

I am looking for a method to host VoiP conference calls. Asterisks maybe overkill for this. But it would be something that would run on a linux server and the clients can be multi-platform (any-os). I’m looking for a replacement to those free conference call lines that I can put on one of my servers to be a bit more trusted. It doesn’t need to be able to support land lines.

Maybe something like TeamSpeak…

Any Suggestions?

–Craig maybe?