Treo - Treo is the page speed monitoring tool that helps your customers from obtaining a faster web experience.
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.
Watchman Monitoring - Watchman Monitor is a powerful and easy-to-use, system monitoring & reporting tool.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Deppbot - Continuous Updates - Based on your configured schedule, deppbot will run bundle update on your Ruby app and send the result as a Pull Request to GitHub.
Better Uptime - We call you when your website goes down