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.
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.
colloquy is an Internet talker server. It lets people all around the world talk to each other in real time. It is inspired by The Nilex Talker and Egham Hills, a popular "technical" talker in the UK. It is explicitly designed not to have "socials" and "custom rooms" and other bloat that just gets in the way of idle chat like many other talker servers.
Devalot is a social networking application centered around software projects. It connects the user community with the development community and encourages participation and communication. It includes all the features you've come to expect in modern Web-based applications such as tagging, comments, and a wiki, as well as features you'd expect in project tracking software such as ticketing. It has features similar to some of those found in Trac, Collaboa, GForge, Mephisto, and Typo.