Selectivizr : CSS3 pseudo-class and attribute selectors for IE 6-8
CSS3 PIE: CSS3 decorations for IE : Flexibility is a polyfill for Flexible Box Layout Module Level 1. Use it to design beautiful, flexible layouts on the web without sacrificing the expe...
HTML5 Cross Browser Polyfills : So here we're collecting all the shims, fallbacks, and polyfills in order to implant html5 functionality in browsers that don't natively support them.
320 and up : ‘320 and Up’ is a lightweight, easy to use and content first responsive web design boilerplate.
Flexibility is a polyfill for Flexible Box Layout Module Level 1. Use it to design beautiful, flexible layouts on the web without sacrificing the experience in older Internet Explorer browsers.