If you are programmer and want to contribute by creating some kind of program (nap client for example) here is list of useful links: Napster protocol specification. Similar document from OpenNap project. (document on SlavaNap site contains more information). NapDev mailing list. Here is list of available source codes (links are to project's web site): OpenNap source code (written in C). TekNap source code (written in C). Lopster source code (written in C, for Linux only).