TinyWall - Lightweight and non-intrusive firewall
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.
Windows Firewall Control - Windows Firewall Control is not the built in firewall system in the Windows operating systems.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Windows 10 Firewall Control - Windows 10 Firewall Control: simple and exhaustive solution for applications network activity controlling and monitoring.
Better Uptime - We call you when your website goes down