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.
GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
Better Uptime - We call you when your website goes down
Goodreads - See what your friends are reading.