GitHub Repository Size - Browser extension to show file and repo size in GitHub
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.
replit - Code, create, andlearn together. Use our free, collaborative, in-browser IDE to code in 50+ languages — without spending a second on setup.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Repostimeline - Repostimeline is an open-sourced web app that lets you generate a stunning timeline of your GitHub public projects.
Better Uptime - We call you when your website goes down