perf - Perf is a simple app monitoring solution paired with meaningful alerts.
Treo - Treo is the page speed monitoring tool that helps your customers from obtaining a faster web experience.
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.
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.
strace - Trace system calls and signals. A diagnostic, debugging and instructional userspace utility.
Loado - Loado is an easy-to-use monitoring tool for websites that helps developers, products, and marketers to improve user conversions and optimize SEO strategies.