Tunable - Tone and chord generator, chromatic tuner and metronome for mobile.
oTuner - oTuner is a Free, Open Source Chromatic Tuner for Windows and Windows Mobile (or Pocket PC).
AP Tuner - APTuner is a sophisticated chromatic tuner for your computer, tablet, and phone.
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.
PitchLab Guitar Tuner - PitchLab Guitar Tuner is a software that helps artists to tune their guitar, and it comes with a chromatic tuner for free.
TuneCrack - TuneCrack stands for: Crack the tuning problem. The importance of tuning is often underestimated.