Numeral
A javascript library for formatting and manipulating numbers.
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
Stringformatter
JS string formatter that supports objects, currency, date/time, decimals, and more supports easy extension and garbage collection ... goes far beyond sprintf approach.
Sprintf.js
sprintf.js is a complete open source JavaScript sprintf implementation.
Classing Js
Brings the world of classical OOP to javascript
Flexie
Legacy support for the CSS3 Flexible Box Model
Timezone Js
Timezone-enabled JavaScript Date object. Uses Olson zoneinfo files for timezone data.
Moment
Parse, validate, manipulate, and display dates in javascript.
Console.message
Console messages for cool kids
Selectivizr
Selectivizr is a JavaScript utility that emulates CSS3 pseudo-classes and attribute selectors in Internet Explorer 6-8.
Poly
Small, fast, awesome. The only ES5-ish set of polyfills (shims) you can mix-and-match because they're individual AMD modules.
Yepnope.js
An Asynchronous Conditional Resource Loader
ES5 Shims
ECMAScript 5 compatibility shims for legacy JavaScript engines
Date
Date() for humans