Equipped with a Raspberry Pi and a camera, my roomba not only collects dust when cleaning my flat but also data. Using a web interface, the roomba can be controlled from anywhere on earth. (Link to a talk in German.)
FrOSCH is the Free and Open Source Conference Helper. It is a conference system created for Pi and More. It currently supports visitor registration and "call for contributions", and it manages rooms, contributions, and speakers. Future extensions are planned.
VCWalker recursively checks SVN or GIT repositories for remote and local changes. By default, VCWalker shows whether remote changes, local (committed) changes, and locally modified or added files are present. It can also attempt to update (or pull) remote changes, and to automatically upgrade SVN repositories to the latest on-disk format of SVN (upgrade).