Es6 Shim
ECMAScript 6 (Harmony) compatibility shims for legacy JavaScript engines
Length.js
📏 JavaScript library for length units conversion.
Svgeezy
Allows for automatic Image fallbacks for browsers that can't handle SVGs
CSS3 Pie
A behavior for Internet Explorer allowing it to recognize and render various CSS3 box decoration properties
Xdate
A Modern JavaScript Date Library
ES5 Shims
ECMAScript 5 compatibility shims for legacy JavaScript engines
Stringformatter
JS string formatter that supports objects, currency, date/time, decimals, and more supports easy extension and garbage collection ... goes far beyond sprintf approach.
Classing Js
Brings the world of classical OOP to javascript
Poly
Small, fast, awesome. The only ES5-ish set of polyfills (shims) you can mix-and-match because they're individual AMD modules.
Flexie
Legacy support for the CSS3 Flexible Box Model
Timezone Js
Timezone-enabled JavaScript Date object. Uses Olson zoneinfo files for timezone data.
Console.message
Console messages for cool kids
Moment
Parse, validate, manipulate, and display dates in javascript.
Selectivizr
Selectivizr is a JavaScript utility that emulates CSS3 pseudo-classes and attribute selectors in Internet Explorer 6-8.
Angled Edges
:triangular_ruler: Quickly create angled section edges using only Sass
Date
Date() for humans
Yepnope.js
An Asynchronous Conditional Resource Loader