Justune Guitar Tuner - Justune - a guitar tuner
MyGuitarTuner.com - Online microphone tuner for guitar, ukulele, violin and other instruments. Tune by ear or using the microphone of your device. It's fast and accurate algorithm makes it one of the best online microphone tuners available.
oTuner - oTuner is a Free, Open Source Chromatic Tuner for Windows and Windows Mobile (or Pocket PC).
Fine Tuner - Fine Tuner is a minimalistic guitar tuner that utilizes your device's built-in microphone.
TuneCrack - TuneCrack stands for: Crack the tuning problem. The importance of tuning is often underestimated.
LINGOT - Musical instrument tuner, LINGOT is a musical instrument tuner.