NSFOCUS - NSFOCUS provides comprehensive, end-to-end protection from the debilitating effects of DDoS attacks.
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.
Incapsula DDoS - Incapsula DDoS is a platform that comes with multiple DDoS protection options and mitigates attacks without incurring latency.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Arbor DDoS - Arbor DDoS is a platform which helps the users in understanding their environments along with their threat actors and delivers powerful visibility and traffic intelligence at internet scale.
Better Uptime - We call you when your website goes down