Stylus Pilot - drag a crosshair target across the screen with the stylus in order to display the digitizer error.
If the user considers the error to be too large, the app exits to System Prefs with "p" in order to re-calibrate.
If recalibration is not considered necessary, the offset is still useful in aiming the stylus at buttons, text positions, etc
SoundFX is a free utility for programmers (or the curious) who would like to test how various tones sound through the Palm speaker system. This makes it very easy to program sounds (or sequences) by adjusting the slider bar until the tone that you want is played