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.
FreedomBox - FreedomBox is a personal server running a free software operating system, with free applications designed to create and preserve personal privacy.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
DockSTARTer - DockSTARTer helps you get started with home server apps running in Docker.
Better Uptime - We call you when your website goes down
SlapOS - SlapOS is a decentralized Cloud Computing technology.