MLDonkey is an open source, free software multi-network peer-to-peer application. It is also the name of the peer-to-peer overlay network that the MLDonkey uses. Originally a Linux client for the eDonkey protocol, it now runs on many flavors of Unix-like, Mac OS X, Windows and MorphOS and supports numerous peer-to-peer protocols. It is written in Objective Caml, with some C and even some Assembly parts.