AutoNap is a console napster/opennap-client written in Perl (requires 5.6) with both interactive and non-interactive mode allowing to let it run unattendedly.
gnap is a gnome napster client.
Gnapster is a simple client for the Napster online mp3 community. Currently, Gnapster supports most major features of the protocol including search, queue, download, browse, upload, and chat.
gnome-napster is a discontinued multithreaded Napster client for GNOME.
knapster is a KDE napster client clone. It supports logins, a number of searches, downloads, queueing, uploads and messages/channels.
Koog Epsilon is dedicated toward providing a very friendly napster experience on KDE.
Linux Napster Client
Linux Napster Client is a client for Napster that runs under Linux. Napster is a very large music library.
Lopster is a filesharing client that formerly connected to the Napster network only. Basic IRC support was available too.
napMan is an infobot that provides you with a real time glimpse into the current state of the worldwide network of nap servers that are based on either the closed source napster protocol or the open source opennap protocol.
Napsack is a specialized multi-threaded client for broadcasting Napster queries across multiple servers; the list of target servers is retrieved from www.napigator.com, and is user-filterable (based on the number of users, files, or gigs indexed).
Opennap NG is a free, non-commercial open source server software for Unix and Windows, serving the original Napster peer 2 peer filesharing protocol, to be used with clients such as Lopster / WinLop, XNap, WinMX, AudioGnome and others.
XmNap is a Motif napster client. It bears some resemblance with TkNap, although it differs in several areas, such as using a dedicated configuration window.