Fine Tuner - Fine Tuner is a minimalistic guitar tuner that utilizes your device's built-in microphone.
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.
Online Guitar Tuner - We can say it is the "suggested", "universal" or standard guitar tuning.
Metronomus - Powerful and beautiful online metronome
Guitar Tuna - GuitarTuna is the easiest, fastest and most accurate guitar tuner app out there!
TapNTune - TapNTune is a fully functional application that can help users tune their instruments with ease, and users can use it on their Mac system.