Well although the server is only git itself, i think he means the notification server, which he can host himself with the help of the node.js server.
I gave sparkleshare a shot, but I'm kind of disappointed atm. The syncs are taking time and also the recognition of new data takes like a minute compared to dropbox which is just few seconds.
Also the lack of smart http git support, which works with minor adjustments is still not the dream. Why smart http git? because its faster than the old git server itself. Even github is already offering smart http.
Adding to the above, the system is written in dot net or c# and is only running in other os with the help of mono. Would have liked to see it in c++ with eg. qt as frontend.
But of course you should make your own mind about the software.