Justune Guitar Tuner - Justune - a guitar tuner
TuneCrack - TuneCrack stands for: Crack the tuning problem. The importance of tuning is often underestimated.
oTuner - oTuner is a Free, Open Source Chromatic Tuner for Windows and Windows Mobile (or Pocket PC).
PitchPerfect - PitchPerfect is a free guitar tuner that is developed by NCH Software. It combines automatic note detection with a user-friendly interface to provide accurate tuning for a variety of six-string instruments.
PitchBlitz - PitchBlitz prepares you for the Pitch Grid Test.
Pitch Grid Test - Measure your pitch-distance precision recognition. The resulting relative pitch indicator shows your sense for relative pitch.