Avira Home Gaurd - Avira Home Guard is a free home network scanner app that helps secure the smart home, detects all devices connected to your Wi-Fi and tests your internet speed.
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.
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Fingbox - Fingbox home network security device helps you keep your internet safe and secure, allows you to monitor your household digitally and improve your home Wi-Fi experience.
Better Uptime - We call you when your website goes down