openmediavault is the next generation network attached storage (NAS) solution based on Debian Linux.
TVHeadend, sometimes TVH for short, is a server application that reads video streams from LinuxTV sources and publishes them as internet streams.
Syncthing is a free, open-source peer-to-peer file synchronization application. It can sync files between devices on a local network, or between remote devices over the Internet.
Etherpad is a highly customizable open source online editor providing collaborative editing in really real-time.