MLDonkey is a peer to peer application for accessing the Edonkey2000 network as well as a few others like Overnet, FastTrack, Bittorrent, Gnutella and SoulSeek.
mldonkey.el is written in elisp and allows you to monitor your downloads and control the MLDonkey core from within your emacs.
The mldonkey.el homepage provides the source code as well as some documentation.
PeterSalvi: I’ve created a patch (mldonkey-vd.patch.gz) for version 0.0.4 to conform to MLDonkey 2.9.2. Since the website for mldonkey.el seems to be down, I’ve taken the liberty to upload it to mldonkey-el-0.0.4.tar.gz.