Down Services - Get service outage alerts in real time. Know when your favourite service is offline.
Is It Down Right Now? - Network & Admin
UPDOWNtoday - UPDOWNTODAY allows you to check whether the website is down or not.
IsItDown RightNow - "Is It Down Right Now" monitors the status of your favorite web sites and checks whether they are down or not.
Site Down - Site down outage and downtime reports from SiteDown.co
Ruler for Windows - It's a screen ruler for Windows.