Guitaroid - Listen to Guitaroid | SoundCloud is an audio platform that lets you listen to what you love and share the sounds you create.
TempoPerfect Metronome - TempoPerfect is a free software metronome.
Metronomus - Powerful and beautiful online metronome
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.
AudioKit Hey Metronome - Visit the post for more.
afractal Metronome - Highly perfomant, easy to use, minimalistic digital metronome desktop app.