Protect the mule from spam
Share your photos online via P2P
File sharing program running on the Gnutella Network
Software that allows you to share your files through email
Torrent software - easy to download, filters through viruses automatically
Windows NFS server sharing files with Unix
Web server with integrated file sharing application
MP3Treat is a music downloading client.
MeteorShare is a great P2P software.
MediaZup is BitTorrent client of a new generation. You can easily find any file you look for and download it.