Incapsula - Incapsula is a Security CDN that makes any website safer, faster and more reliable. 5 minute setup will make a world of difference.
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.
Sqreen - Sqreen is a web application security monitoring and protection solution helping companies protect their apps and users from attacks. Get started in minutes.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Burp Suite - Burp Suite is an integrated platform for performing security testing of web applications.
Better Uptime - We call you when your website goes down