Mathjs
An extensive math library for JavaScript and Node.js
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**).
Tiny Color
Fast, small color manipulation and conversion for JavaScript
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
Big.js
A small, fast JavaScript library for arbitrary-precision decimal arithmetic.
Bignumber.js
A JavaScript library for arbitrary-precision decimal and non-decimal arithmetic
Datejs
Datejs is an open-source JavaScript Date Library.
Args.js
Create javascript functions with optional, default, grouped and named parameters.
Char Funk
a Unicode character utility for JavaScript
Klass
a utility for creating expressive classes in JavaScript
Xdate
A Modern JavaScript Date Library
Core Lib
A port of the Ruby 1.9.3 corelib to coffeescript/javascript/node that conforms to rubyspec.org.
Object.observe
Object.observe polyfill/shim trying to be compliant
Sprintf.js
sprintf.js is a complete open source JavaScript sprintf implementation.
Timezone Js
Timezone-enabled JavaScript Date object. Uses Olson zoneinfo files for timezone data.
Date
Date() for humans