enquire.js : A lightweight, pure JavaScript library for responding to CSS media queries.
Sizzy : A tool for developing responsive websites crazy-fast.
Open sourced : https://github.com/kitze/sizzy
Normalize.css : A modern, HTML5-ready alternative to CSS resets
Normalize.css makes browsers render all elements more consistently and in line with modern standards. ...
This Is Responsive : Tips, Resources and Patterns for Responsive Web Design
css3-mediaqueries-js : make CSS3 Media Queries work in all browsers (JavaScript library)
Skeleton: A Dead Simple, Responsive CSS Boilerplate for Mobile-Friendly Development
