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.
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).
LINGOT - Musical instrument tuner, LINGOT is a musical instrument tuner.
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.