Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Fine Tuner - Fine Tuner is a minimalistic guitar tuner that utilizes your device's built-in microphone.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Metronomus - Powerful and beautiful online metronome
Better Uptime - We call you when your website goes down
LINGOT - Musical instrument tuner, LINGOT is a musical instrument tuner.