Incapsula DDoS - Incapsula DDoS is a platform that comes with multiple DDoS protection options and mitigates attacks without incurring latency.
UptimeRobot - Free Website Uptime Monitoring
NSFOCUS - NSFOCUS provides comprehensive, end-to-end protection from the debilitating effects of DDoS attacks.
Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
StackPath Web Application Firewall - StackPath Web Application Firewall is a cloud-delivered security service that provides layered security for web applications that is based on the best practices of Enterprise Security.
UptimeRobot App - Web, SSL, ports & Cron-jobs monitoring