BitTorrent is a tool for copying files from one machine to another. FTP punishes sites for being popular. Since all uploading is done from one place, a popular site needs big iron and big bandwidth. With BitTorrent, clients automatically mirror files they download, making the publisher's burden almost nothing.
Coherence is a set of DLNA/UPnP devices, like MediaServer and MediaRenderer. In addition, it includes a well-designed framework to extend other applications with DLNA/UPnP functionality. It also has an emerging DBus API, enabling these applications to participate in digital living networks. It supports Playstation 3 (PS3), XBox, and many other devices.
TorrentSniff reports current status information on a BitTorrent torrent including what files it contains and the current number of seeds (machines sharing the complete torrent) and leeches (machines still downloading the torrent). It is useful for comparing multiple potential sources of a file to find the best-seeded torrent.
BRisa is a framework written in Python that allows the creation of UPnP devices, focusing on Media Servers and Media Renderers. Regarding the Media Server reference implementation, it allows users to share and search content from UPnP A/V devices. It offers a plugin architecture enabling users to share their own content stored in multimedia portals, such as SHOUTcast, Flickr, and recently incorporated YouTube Videos. In addition, the framework also provides a very simple UPnP control point API, which is being used by the Canola Project.
Torrent Swapper is a sociable peer to peer file-sharing client based on the BitTorrent protocol. It has a basic understanding of human friendships, of user tastes in content, and of Internet connectivity between users. Torrent Swapper boasts unique features like Amazon-like recommendations to get interesting files, doubling the download speed by using the upload capacity of friends, real-time P2P file sharing with P2P video streaming, and showing the locations of seeders and leechers of the same content with city-level accuracy on a world map.