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.
Savelist - Found products you want but not ready to buy?
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Better Uptime - We call you when your website goes down
Price Snoop - When viewing a product on Amazon, Price Snoop will show you just how much it costs on the other...