Screenfly : Test Your Website at Different Screen Resolutions
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...
Site Valet : Web Tools for Quality, Accessibility, Standards Compliance.
tota11y : an accessibility visualization toolkit that aims to reduce the friction of a11y testing
webhint : webhint is a linting tool that will help you with your site's accessibility, speed, security and more, by checking your code for best practices and co...
The mobiReady testing tool evaluates mobile-readiness using industry best practices & standards.