OpenDNS Umbrella - Cloud Security
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.
Cisco Umbrella - Cisco Umbrella is a cloud security platform that provides the first line of defense against threats on the internet.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Code42 - Code42 is a SaaS solution for enterprises that secures all user data on one secure platform, leaving you and your business secure in the knowledge that both your employee's and customer's data is protected. Read more about Code42.
Better Uptime - We call you when your website goes down