UptimeRobot - Free Website Uptime Monitoring
Openwhyd - Collect and Share the tracks you love.
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.
Zoff - Collaborate on a live music and video playlist with your friends.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Music Smasher - Find any song. Music Smasher searches Spotify, Rdio, SoundCloud, Bandcamp, and YouTube.