Open Source @IFTTT - A collection of IFTTT OSS projects.
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.
Code NASA - 253 NASA open source software projects
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Google Open Source - All of Googles open source projects under a single umbrella
Better Uptime - We call you when your website goes down