McCaskill Weather Centre is a graphical desktop client that interfaces with USB weather stations.
Supported hardware includes the SmartWeather Pro, Watson WH1080/WH2080, Watson W8681, and many others.
Qmmp (Qt-based Multimedia Player) is an audio player with a user interface similar to Winamp or Xmms. Alternative user interfaces also are available.
A control protocol for various astronomical instruments (telescopes, CCDs, etc).
A command line tool to output your database schema and data in diff-able form.