MQtest.io — A simple tool to help identify which media queries your device responds to.
Free Mobile Performance Testing with Akamai's Mobitest
Test your website performance on a mobile device
min-device-pixel-ratio test
What’s your device’s min-device-pixel-ratio?
Responsive Design : Le guide de référence pour les SEOs
Web Design réactif Article traduit de Seomoz.org : Responsive Web Design: The Ultimate Guide for Online Marketers http://www.seomoz.org/ugc/responsive-web-design-the-ultimate-guide-for-online-marketers
This Is Responsive | Tips, Resources and Patterns for Responsive Web Design
Patterns, resources and news for creating responsive web experiences
Screenqueri.es | Pixel Perfect Responsive Design Testing Tool
Sweet
Where are the Mobile First Responsive Web Designs? « Cloud Four
Responsible responsive images
Techniques For Gracefully Degrading Media Queries
Responsive Web Design: Helpful Articles, Techniques & Tutorials
A Beautiful Boilerplate for Responsive, Mobile-Friendly Development