StatusGator - Monitor all your hosted applications, vendors, and websites, and keep your team informed of outages. StatusGator is the world's premier status aggregator, status page, and website monitoring tool.
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.
stts - St. Teresa of Avila Catholic School is a Pre-K through 8th grade school educating children for over 55 years in the Catholic Tradition.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Better Uptime - We call you when your website goes down
IsDown App - Monitor all your cloud services status pages in one place