Vanido - Vanido is a singing coach in your pockets.
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.
Singscope - See your pitch analyzed as you sing
Metronomus - Powerful and beautiful online metronome
User Inyerface - A painful illustration of bad UX
LINGOT - Musical instrument tuner, LINGOT is a musical instrument tuner.