Vocalist - Vocalist is an all-in-one music utility.
Fine Tuner - Fine Tuner is a minimalistic guitar tuner that utilizes your device's built-in microphone.
Singscope - See your pitch analyzed as you sing
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.
Vanido - Vanido is a singing coach in your pockets.
Metronomus - Powerful and beautiful online metronome