Sugar
A Javascript library for working with native objects.
Nerdamer
a symbolic math expression evaluator for javascript
Char Funk
a Unicode character utility for JavaScript
Ratio.js
Rational numbers for Javascript
Extract Values
A simple helper to extract values from a string based on a pattern.
Typecast.js
Typecast.js :: Solving the simple problems
Object.observe
Object.observe polyfill/shim trying to be compliant
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.
Es6 Shim
ECMAScript 6 (Harmony) compatibility shims for legacy JavaScript engines
Placeholders.js
A JavaScript polyfill for the HTML5 placeholder attribute
Numeral
A javascript library for formatting and manipulating numbers.
Core Lib
A port of the Ruby 1.9.3 corelib to coffeescript/javascript/node that conforms to rubyspec.org.
HTML5shiv
This script is the defacto way to enable use of HTML5 sectioning elements in legacy Internet Explorer.
Args.js
Create javascript functions with optional, default, grouped and named parameters.
Angled Edges
:triangular_ruler: Quickly create angled section edges using only Sass
Datejs
Datejs is an open-source JavaScript Date Library.