Galen Framework : Automated testing of look and feel for your responsive websites.
Layout testing seemed always a complex task. Galen Framework offers a simple solution...
This Is Responsive : Tips, Resources and Patterns for Responsive Web Design
Skeleton : Skeleton: A Dead Simple, Responsive CSS Boilerplate for Mobile-Friendly Development
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
Foundation : An easy to use, powerful, and flexible framework for building prototypes and production code on any kind of device.
Breaking CSS is easy. Checking every responsive page element is hard. That’s why there's BackstopJS.
