CS183B - Startup Class - Stanford class taught by Sam Altman & guest speakers
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.
YC Startup Class - A live, one-hour class by Sam Altman on Platzi
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Google Classroom - Learning management tool by Google
Better Uptime - We call you when your website goes down