WebGazer is an uptime monitoring platform that checks if your website is up as it should be and notifies you if anything goes wrong
UptimeRobot - Free Website Uptime Monitoring
UXPin + Slack - Keep tabs on design projects in Slack
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Attentive - A marketing channel, built for retail & e‑commerce
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.
Get Notified - Get Notified when something happens