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.
ChordU - Extracts chords from any song, integrated YouTube.
Metronomus - Powerful and beautiful online metronome
Guitaa.com - Turn ANY song into chords, play along with interactive chords and diagram, transpose, loop, tempo control.
LINGOT - Musical instrument tuner, LINGOT is a musical instrument tuner.
Chordify - Chordify turns any music or song (YouTube, Deezer, SoundCloud, MP3) into chords.