ED2k
From AMule Project FAQ
eD2k is a server-dependent network for the *Mule (and some others compatible) clients.
For information about this network you can either read the FAQ_eD2k-Kademlia#What_is_ED2K? or see http://emule-project.net/home/perl/help.cgi?l=1&rm=show_topic&topic_id=232