Appium : Appium is an open source test automation framework for use with native, hybrid and mobile web apps.
It drives iOS and Android apps using the WebDriver...
Diagnostic.css : Diagnostic.css is a stylesheet which allows the user to test for common errors in a page's markup.
Also : https://github.com/karlgroves/diagnostic.css
Screenfly : Test Your Website at Different Screen Resolutions
W3C mobileOK Checker : This checker performs various tests on a Web Page to determine its level of mobile-friendliness.
tota11y : an accessibility visualization toolkit that aims to reduce the friction of a11y testing
The mobiReady testing tool evaluates mobile-readiness using industry best practices & standards.
