Missing a spirit level at home developer Alanceil decided to use the Wiimote as a replacement. Put the Wiimote on a surface you want to use as a reference and press A. This will start a calibration, and afterwards you can put it on a target surface to see its difference in inclination.

Changes:

Chg: Median instead of arithmetic mean is now used to get calibration values, this should increase accuracy.
Chg: Message class now handles text drawing
Add: Internal info on pressing B in the slider box screen
Add: Arc graph showing current tilt

http://wiibrew.org/wiki/Leveltool