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.
NSFOCUS - NSFOCUS provides comprehensive, end-to-end protection from the debilitating effects of DDoS attacks.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
AWS Shield - AWS Shield is a managed Distributed Denial of Service (DDoS) protection service that safeguards web applications running on AWS.
Better Uptime - We call you when your website goes down
VeriSign - VeriSign Authentication Services provides solutions that allow companies & consumers to engage...