can client

OmniDictionary is a Mac OS X client for network dictionary servers.

Delibar, Delicious client for Mac

Lynx is a fully-featured World Wide Web (WWW) client for users

A new, protocol compatible BitTorrent client that is optimized for fast download

Fast IRC chat client.

SoulSeek P2P client.

xMule is a client for the eDonkey peer-to-peer file sharing network."

Email client now based on Thunderbird.

IRC chat client.

Java OpenNap, Gnutella & OpenFTP client.