Fine Tuner - Fine Tuner is a minimalistic guitar tuner that utilizes your device's built-in microphone.
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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.
Visible - Visible is a wireless service by Verizon that offers unlimited data for a small price and enables you to earn a few bucks by referring friends.
LINGOT - Musical instrument tuner, LINGOT is a musical instrument tuner.
Metronomus - Powerful and beautiful online metronome