From Michael Dombrowski:
With the program "Protractor" you are constructing protractors to your own will. The subdivision is possible in degrees and gon. The color display, labeling, and orientation can be adjusted within wide ranges. All four quadrants may be separately toggled on or off. You can for example CD labels printed with a protractor and then stick them on a CD no longer required. This allows, among other things continue to use promotional CD's. It can simultaneously handle multiple protractor with different radii are printed on one sheet.