Mathjs
An extensive math library for JavaScript and Node.js
Xdate
A Modern JavaScript Date Library
Bignumber.js
A JavaScript library for arbitrary-precision decimal and non-decimal arithmetic
Tiny Color
Fast, small color manipulation and conversion for JavaScript
jQuery Number
Easily format numbers for display use. Replace numbers inline in a document, or return a formatted number for other uses.
Timezone Js
Timezone-enabled JavaScript Date object. Uses Olson zoneinfo files for timezone data.
Inversify Js
A powerful and lightweight inversion of control container for JavaScript & Node.js apps powered by TypeScript.
Decimal.js
An arbitrary-precision Decimal type for JavaScript
Classing Js
Brings the world of classical OOP to javascript
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
Core Lib
A port of the Ruby 1.9.3 corelib to coffeescript/javascript/node that conforms to rubyspec.org.
Args.js
Create javascript functions with optional, default, grouped and named parameters.