eDonkey2000 (nicknamed "ed2k") was a peer-to-peer file sharing application developed by US company MetaMachine (Jed McCaleb and Sam Yagan), using the Multisource File Transfer Protocol. It supported both the eDonkey2000 network and the Overnet network.
On September 28, 2005, eDonkey was discontinued following a cease and desist letter from the RIAA.