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...
Maestro : Maestro is the easiest way to automate UI testing for your mobile app.
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
tota11y : an accessibility visualization toolkit that aims to reduce the friction of a11y testing
aXe : Automated tool to find Accessibility defects on your web site by using the aXe Chrome extension. Drop the aXe on your accessibility defects! We believ...
The mobiReady testing tool evaluates mobile-readiness using industry best practices & standards.