OpenNap

Napigator is a free navigator to nap servers. It is an exclusive guide for helping find almost all the Internet audio online. Napigator works side-by-side with your favorite Windows nap (Napster-like) client, giving you an up to date status of all nap servers on various networks, including the new and openly free Opennap Network and popular Napster Network.

audioGnome is a revolutionary client that  allows you to connect to multiple opennap servers and other related servers. Unlike such programs as Napster or Morpheus, opennap servers are set up by music lovers like us. audioGnome has all of the features of Napster with a lot more features and server options. audioGnome is the quintessential tool for MP3, WMA and WAV lovers.

WinMX is a peer-to-peer file sharing program authored by Frontcode Technologies and running on Windows operating systems.