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.
Kounteq - Trusted business & finance app stack
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Shoppimon - Shoppimon simulates live shoppers visiting your Magento store and
Better Uptime - We call you when your website goes down
Exoprise - Exoprise provides Digital Experience Monitoring for enterprise SaaS applications like Microsoft 365, Salesforce, ServiceNow, Active Directory, SSO, Okta, Box, and more!