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.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Project Gutenberg - Project Gutenberg offers free ebooks to download.
Better Uptime - We call you when your website goes down
Apple Books - The all-new Apple Books has been redesigned to make finding, reading, and listening to books a beautiful, effortless experience on iPhone and iPad.