Nock Nock is a simple app which allows you to monitor your websites for maximum uptime!
The app will automatically knock on the door of your websites (or web servers) on a chosen interval to make sure they are up and responding successfully. If something is wrong, you get a notification telling you so.
Nock Nock is open source! Contributions (pull requests) are very welcome. https://github.com/afollestad/nock-nock
Graphics by the amazing Kevin Aguilar; check out his work (221 Pixels)!