TempoPerfect Metronome - TempoPerfect is a free software metronome.
Metronomus - Powerful and beautiful online metronome
afractal Metronome - Highly perfomant, easy to use, minimalistic digital metronome desktop app.
Open Metronome - Open Metronome, a Free Open Source Metronome for Windows Mobile and Pocket PC.
Bounce Metronome Pro - Professional musicians are amazed by Bounce Metronome's advanced rhythm capabilities.
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.