This site host diki - the distributed knowledge infrastructure. It is a friend-to-friend (p2p-like) based infrastructure that aims at providing a social semantic web without central servers. Thus it provides the privacy that most application still lack of.
We are building an Open Source Jabber/XMPP solution. Our goal is to provide a complete environment for basic instant messaging use, stable and easy to extend for all variants of instant communication use cases.
Ok so what exactly Google Wave is can be confusing, because there are three parts: the protocol, the server, and the client. A lot of people are really going to miss the boat here if they don't keep the distinction between the three in mind, because I see a lot of people focusing on the wrong parts.
Seems that most still believe Google Wave primarily uses XMPP to pass data around. Turns out, XMPP is only used for server to server federation. Joe Gregorio has a good overview of the actual APIs and protocols used in Wave, but I still found it easier to create a diagram
M. Horng, M. Hung, Y. Chen, J. Pan, and W. Huang. Computer Information Systems and Industrial Management Applications (CISIM), 2010 International Conference on, page 487 -490. (October 2010)