http://freenet.sourceforge.net/ a> — Distributed system for semi-privately storing documents. 
iMesh: http://www.imesh.com/ — User-to-user exchange community. 
Konspire: http://www.csuglab.cornell.edu/Info/People/jcr13 /HardenedCriminal/konspire/konspire.html — A searchable, distributed file sharing system with resumable file transfers. 
Scour Exchange: http://www.scour .net/Software/Scour_Media_Agent/ — Napster-like for all formats. 
Some perspective on the issues
 
Andy Oram: Gnutella and Freenet Represent True Technological Innovation — http://www.oreillynet.com/pub/a/network/2000/05/12/ magazine/gnutella.html 
Andy Oram: The Value of Gnutella and Freenet — http: //www.webreview.com/pub/2000/05/12/platform/index.html 
Taken from the Nettime list.