Stashboard - Stashboard is a status dashboard for APIs and software services.
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.
Cachet - Cachet is a free, open source status page for your API, service or company. Built with all of the features that you'd expect from a status page.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
Better Uptime - We call you when your website goes down