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.
Trace - Visualized Node.js monitoring
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
WeBlock - Weblock allows you to block online content.
Better Uptime - We call you when your website goes down
SponsorBlock - SponsorBlock is an open-source crowdsourced browser extension to skip sponsor segments in YouTube videos.