Healthchecks.io - Monitor your cron jobs and scheduled tasks, get notified when they fail.
RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
Pingbreak - Pingbreak is an original and free monitoring service.
Dealspotr - Dealspotr is like Wikipedia for deals.
DownDetector - A simple service to tell you whether a website is down.
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.