RCXDatalog is a GUI-based Unix tool to interact with the Lego Mindstorms RCX brick. Using RCXDatalog, you can upload the datalog of the RCX and display it on your screen or print it to a PostScript printer. It also includes some additional widgets to show light and touch sensor readings of the RCX.
pygps is a GPS user interface. It shows a listing of satellites, their locations in the sky, a list of latitude, longitude, altitude, status, etc., and moving maps. It was designed to work on the Compaq (now HP) iPAQ PDA running Linux, with a 240x320 screen. However, it uses glade, so that it also works nicely on larger screens, or on a landscape orientation of 320x240. It works with any GPS receiver supported by gpsd (which see).