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.
Promon SHIELD - Promon SHIELD™ - Protecting Apps that run within untrusted operating systems. Implement RASP Security and Application Shielding to any App, in minutes!
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Arxan - Arxan offers weba nd mobile application security solutions.
Better Uptime - We call you when your website goes down
Oversecured - Enterprise vulnerability scanner for Android and iOS apps. It offers app owners and developers the ability to secure each new version of a mobile app by integrating Oversecured into the development process.