- http://www.responsinator.com/ (& bookmarklet)
- http://www.jordanm.co.uk/lab/responsiveroulette
- http://responsive.is/trentwalton.com
- http://people.apache.org/~pmuellr/weinre/docs/latest/Home.html
- http://html.adobe.com/edge/inspect/
- http://mqtest.io/ test your device's media query capability
- South Street https://github.com/filamentgroup/Southstreet
- Flexbox http://benfrain.com/understanding-the-css3-flexbox-flexible-box-layout-module/
- AppendAround https://github.com/filamentgroup/AppendAround
- RequireJS http://requirejs.org/
- QuickConcat https://github.com/filamentgroup/quickconcat
- Ajax Include https://github.com/filamentgroup/Ajax-Include-Pattern/
- Conditional Loading http://24ways.org/2011/conditional-loading-for-responsive-designs
- Background Images http://voormedia.com/blog/2012/11/responsive-background-images-with-fixed-or-fluid-aspect-ratios
- Background Image http://elliotjaystocks.com/blog/better-background-images-for-responsive-web-design/
- http://dev.opera.com/articles/view/responsive-images-problem/
- PictureFill https://github.com/scottjehl/picturefill/
- Adaptive Images http://adaptive-images.com/
- Responsive Image Techniques http://css-tricks.com/which-responsive-images-solution-should-you-use/
- Checks bandwidth to determine to load images https://github.com/teleject/hisrc
- ForesightJS, network and resolution https://github.com/adamdbradley/foresight.js
- RetinaJS (doesn't check network bandwidth) http://retinajs.com/
- Breakpoints.JS http://xoxco.com/projects/code/breakpoints/
- onMediaQuery https://github.com/JoshBarr/js-media-queries
- Enquire.JS http://wickynilliams.github.com/enquire.js/
- Categorizr https://github.com/bjankord/Categorizr
- Hide Address Bar https://github.com/scottjehl/Hide-Address-Bar
- iOS 5 & older orientation bugfix https://github.com/scottjehl/iOS-Orientationchange-Fix
- MediaQueries Polyfill https://github.com/paulirish/matchMedia.js/
- Dynamic Carousel https://github.com/Wilto/Dynamic-Carousel/
- Responsive Slider http://responsive-slides.viljamis.com/
- Compass Responsive Grid http://susy.oddbird.net/
- Semantic.gs Semantic Grid http://semantic.gs/
- Inuit.CSS http://csswizardry.com/fluid-grids/
- Singularity http://singularity.gs/
- http://css-tricks.com/media-queries-sass-3-2-and-codekit/
- http://thesassway.com/intermediate/responsive-web-design-in-sass-using-media-queries-in-sass-32
- Sass 3.2 mediaqueries gist https://gist.github.com/2028061
- IE Support http://alwaystwisted.com/post.php?s=2012-08-06-a-sass-mixin-for-media-queries-and-ie
- RespondTo Compass extension https://github.com/Snugug/respond-to
- Zurb Foundation http://foundation.zurb.com/