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.
USE Together - Collaborative screen sharing with multiple mouse cursors
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Tuple - Tuple is a Mac-only remote pair programming tool for discerning developers
Better Uptime - We call you when your website goes down
Gitmoji - An emoji guide for your GitHub commit messages