Mathjs
An extensive math library for JavaScript and Node.js
Bignumber.js
A JavaScript library for arbitrary-precision decimal and non-decimal arithmetic
Xdate
A Modern JavaScript Date Library
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.
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
Timezone Js
Timezone-enabled JavaScript Date object. Uses Olson zoneinfo files for timezone data.
Classing Js
Brings the world of classical OOP to javascript
Extract Values
A simple helper to extract values from a string based on a pattern.
Nerdamer
a symbolic math expression evaluator for javascript
Char Funk
a Unicode character utility for JavaScript
Auto Numeric
autoNumeric is a jQuery plugin that automatically formats currency (money) and numbers as you type on form inputs. It supports most International numeric formats and currency signs including those used in Europe, North and South America, Asia and India (lakhs**).
Args.js
Create javascript functions with optional, default, grouped and named parameters.
Typecast.js
Typecast.js :: Solving the simple problems
Object.observe
Object.observe polyfill/shim trying to be compliant
Ratio.js
Rational numbers for Javascript