Tenable.io - Tenable.io Cyber Exposure platform helps to protect any asset on any computing platform and eliminate blind spots.

NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.

BreachLock - BreachLock is a versatile platform that provides scalable and smooth penetration testing services for vulnerabilities.

Server Monitoring - A server monitor is a tool that monitors your server and website on close intervals and reports to you if it's inaccessible.

Qualys - Qualys helps your business automate the full spectrum of auditing, compliance and protection of your IT systems and web applications.

Nodeping - NodePing Server Monitoring and Web Site Monitoring. Simple but powerful Internet service monitoring.