What are some open source skype alternatives? The ones I have used all require central server. I would like to see something which is more p2p with super nodes.
Is that a model that would actually still scale? As far as I remember, supernodes require an unfirewalled public IP and clients that are available for extended periods of time, i.e. somebody's desktop tower PC. How many of these are still around these days and are allowed to run non-corporate approved software?