Tired of adding prefix for each broswer when it comes to the new css3 attributes?
Legacy support for the CSS3 Flexible Box Model
:triangular_ruler: Quickly create angled section edges using only Sass
Object.observe polyfill/shim trying to be compliant
A fast & lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more)
An Asynchronous Conditional Resource Loader
Allows for automatic Image fallbacks for browsers that can't handle SVGs
A tool to show and add tags to images