Babel
Babel is a compiler for writing next generation JavaScript.
Mathjs
An extensive math library for JavaScript and Node.js
Decimal.js
An arbitrary-precision Decimal type for JavaScript
Tiny Color
Fast, small color manipulation and conversion for JavaScript
Poly
Small, fast, awesome. The only ES5-ish set of polyfills (shims) you can mix-and-match because they're individual AMD modules.
Inversify Js
A powerful and lightweight inversion of control container for JavaScript & Node.js apps powered by TypeScript.
Placeholders.js
A JavaScript polyfill for the HTML5 placeholder attribute
Timezone Js
Timezone-enabled JavaScript Date object. Uses Olson zoneinfo files for timezone data.
Nerdamer
a symbolic math expression evaluator for javascript
Bignumber.js
A JavaScript library for arbitrary-precision decimal and non-decimal arithmetic
Selectivizr
Selectivizr is a JavaScript utility that emulates CSS3 pseudo-classes and attribute selectors in Internet Explorer 6-8.
Xdate
A Modern JavaScript Date Library
jQuery Number
Easily format numbers for display use. Replace numbers inline in a document, or return a formatted number for other uses.
Sugar
A Javascript library for working with native objects.
Ratio.js
Rational numbers for Javascript
CSS3 Pie
A behavior for Internet Explorer allowing it to recognize and render various CSS3 box decoration properties
CSS Parent Selector
CSS4 parent selector based on jQuery