xMule is a multi-platform clone of the popular eMule client for the eDonkey filesharing network. Currently supporting various Linux/Unix/BSD platforms, it aims at higher stability and portability than the competitors.
eMule is an open-source implementation of the eDonkey protocol (short: ed2k) with a cleaner GUI and additional features compared to the previous official client. As it is now widely used there exist several modifications (mods) that enhance the original eMule client for special needs.