Find your favourite music with WinMP3Locator!  
   It finds any MP3 even if you don't know exactly its name, verifies if files are really downloadable, defines server access conditions, easily integrates with your favorite download software.
   http://www.winmp3locator.com/

MP3 Easy  
   Search software competitive with Napster, and untraceable. MP3 music from any song/artist can be downloaded at the touch of a button.
   http://www.mp3easy.co.uk

NoNap.8m.com  
   Offers alternative file-sharing programs to Napster, with ratings and network information.
   http://www.nonap.8m.com/

ZDNet's Ultimate CuteMX Guide  
   CuteMX is designed to be a simple way to swap files, easier than Napster and as powerful as Gnutella. Article explains the program and its features.
   http://music.zdnet.com/features/cutemx/

All open Source Napster Server  
   Open source file sharing clients
   http://opennap.sourceforge.net/

Java clone  
   Java clone for mp3 file sharing
   http://www.perham.net/mike/jnap/