Allows for automatic Image fallbacks for browsers that can't handle SVGs
A behavior for Internet Explorer allowing it to recognize and render various CSS3 box decoration properties
JS string formatter that supports objects, currency, date/time, decimals, and more supports easy extension and garbage collection ... goes far beyond sprintf approach.
Small, fast, awesome. The only ES5-ish set of polyfills (shims) you can mix-and-match because they're individual AMD modules.
Legacy support for the CSS3 Flexible Box Model
Console messages for cool kids
:triangular_ruler: Quickly create angled section edges using only Sass
Date() for humans
An Asynchronous Conditional Resource Loader