Justune Guitar Tuner - Justune - a guitar tuner
Fine Tuner - Fine Tuner is a minimalistic guitar tuner that utilizes your device's built-in microphone.
oTuner - oTuner is a Free, Open Source Chromatic Tuner for Windows and Windows Mobile (or Pocket PC).
Metronomus - Powerful and beautiful online metronome
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.
LINGOT - Musical instrument tuner, LINGOT is a musical instrument tuner.