From XMPP WIKI
iChat Server is a component of Mac OS X Server from Apple Inc. It was first introduced with the release of Mac OS X Server version 10.4 ("Tiger"), and was upgraded to version 2 with the release of Mac OS X Server 10.5 in October 2007.
- iChat Server on Apple's Mac OS X Server website
- Inside Apple's Leopard Server OS on InformationWeek
- Source code on Apple's Open Source website.