Typecast.js
Typecast.js :: Solving the simple problems
Moment
Parse, validate, manipulate, and display dates in javascript.
Klass
a utility for creating expressive classes in JavaScript
Classing Js
Brings the world of classical OOP to javascript
Ratio.js
Rational numbers for Javascript
Extract Values
A simple helper to extract values from a string based on a pattern.
Date
Date() for humans
Length.js
📏 JavaScript library for length units conversion.
jQuery Number
Easily format numbers for display use. Replace numbers inline in a document, or return a formatted number for other uses.
Core Lib
A port of the Ruby 1.9.3 corelib to coffeescript/javascript/node that conforms to rubyspec.org.
Stringformatter
JS string formatter that supports objects, currency, date/time, decimals, and more supports easy extension and garbage collection ... goes far beyond sprintf approach.
Console.message
Console messages for cool kids
HTML5shiv
This script is the defacto way to enable use of HTML5 sectioning elements in legacy Internet Explorer.
Underscore String
String manipulation extensions for Underscore.js javascript library.
Poly
Small, fast, awesome. The only ES5-ish set of polyfills (shims) you can mix-and-match because they're individual AMD modules.
Css3 Finalize
Tired of adding prefix for each broswer when it comes to the new css3 attributes?
Timezone Js
Timezone-enabled JavaScript Date object. Uses Olson zoneinfo files for timezone data.