MQtest.io — A simple tool to help identify which media queries your device responds to.
Cross Browser Retina/High Resolution Media Queries
Media Query & Asset Downloading Results
Responsive Web Design, most complete guide
Responsive Design Testing
Useful for testing responsive designs
mattkersley/Responsive-Menu - GitHub
Turns any or into a for mobiles and low browser sizes
Media Queries / Dynamic resolution dependent layouts : jQuery
The script adds basic Media-Query-Support (min-width and max-width in px units ) to the browsers (IE8 and older)
Techniques For Gracefully Degrading Media Queries
Adactio: Journal—Sea change
Responsive design