RANDOM.ORG - RANDOM.ORG offers true random numbers to anyone on the Internet.
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.
Random Number Generator - Randomly generate integers or floating point numbers within a given range and specified discrete or continuous statistical probability distribution.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Randommer - Generate random number, telephone numbers, text, hashed and social security numbers
Better Uptime - We call you when your website goes down