WebGazer is an uptime monitoring platform that checks if your website is up as it should be and notifies you if anything goes wrong
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
UptimeRobot - Free Website Uptime Monitoring
Microlink - Extract structured data from any website
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Freshworks - Delight your customers, from wherever you are
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.