IsDown App - Monitor all your cloud services status pages in one place
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.
Feedsme - Feedsme is the business cloud services assistant that automatically integrates, analyzes and...
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Ctatus - CTATUS helps you monitor your external dependencies, catch problems before your clients, and get leverage over your competitors.
Better Uptime - We call you when your website goes down