BizTalk360 - BizTalk360 is a web based production support/monitoring tool for Microsoft BizTalk Server.
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.
NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
mackerel.io - mackerel.io is a server and application performance monitoring platform.
Better Uptime - We call you when your website goes down