MaintainableCSS : Write CSS without worrying that overzealous, pre-existing styles will cause problems. MaintainableCSS is an approach to writing modular, scalable and ...
css3-mediaqueries-js : make CSS3 Media Queries work in all browsers (JavaScript library)
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
BackstopJS : Breaking CSS is easy. Checking every responsive page element is hard. That’s why there's BackstopJS.
CSS Lint : CSS Lint points out problems with your CSS code. It does basic syntax checking as well as applying a set of rules to the code that look for problemati...
Reasonable System for CSS Stylesheet Structure.
A set of simple ideas to guide your process of building maintainable CSS.