File Sharing : Sites like Napster.
Aimster - rides on AOL Instant Messenger service
Media Grab - mp3, vqf, usenet, usenetgrab, webgrab, mediagrab, livewire, Livewire! Broadcast, UsenetGrab!, WebGrab!, LiveWire!, CentiSpede!, MediaGrab!
Freenet - Freenet does not have any form of centralized control or administration. It will be virtually impossible to forcibly remove a piece of information from Freenet. Both authors and readers of information stored on this system may remain anonymous if they wish. Information will be distributed throughout the Freenet network in such a way that it is difficult to determine where information is being stored. Anyone can publish information: they don't need to buy a domain name, or even a permanent Internet connection. Availability of information will increase in proportion to the demand for that information. Information will move from parts of the Internet where it is in low demand to areas where demand is greater.
iNapster - iNapster is a web based interface to the Napster Inc. network. It supports multi-users, account creation, searching, browsing, and downloading through both methods. Preliminary work has been done on uploading support. It is a standalong perl daemon, launched from the command line .. it uses perl's HTTP::Daemon module to provide the web interface so it. a) has no dependency on Apache b) can run as any (non-privileged) user and bind to any port (>1024 unless root).
Things Like Napster, Next Best Things
"You can't be blocked if you don't have an account. That's the beauty of distributed networks like Gnutella, Hotline, and other Napster alternatives. Because there's no central server structure, there's no way to ban people from the network. And there's no company to sue" (The Gnutallica Project)
Gnutella is a real-time search, peer-based file-sharing client that allows a user running a Gnutella client to search for and download files from other Gnutella users.
OpenNap - Napster is a protocol for sharing files between users. With Napster, the files stay on the client machine, never passing through the server. The server provides the ability to search for particular files and initiate a direct transfer between the clients. In addition, chat forums similar to IRC are available. OpenNap extends the Napster protocol to allow sharing of any media type, and the ability to link servers together. opennap is a server for connecting the clients together, and is not a client itself.