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
Drift - A messaging app that helps you grow your business.
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.
Crisp Chat - Multi-channel customer support software
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring