UptimeRobot - Free Website Uptime Monitoring
LogicMonitor - LogicMonitor is the SaaS performance monitoring platform for the world's best IT teams. Deploy Fast, Monitor More, Improve Ops.
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.
Dell Technologies APEX - Dell Technologies APEX is a platform that delivers excellent cloud experiences to major businesses in the world.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Cruz RMM - Cruz RMM is an ideal solution for Managed IT service providers on the lookout for a remote management product to mechanize and track the operations of their user base.