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.
DevTees - Graphic t-shirts made for developers.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Product Hunt - A website that lets users share and discover new products
Better Uptime - We call you when your website goes down
The Practical Dev Shop - Beautifully designed swag for developers ❤️ 👩💻