Typecast.js
Typecast.js :: Solving the simple problems
Placeholder Shiv
Tiny polyfill for the placeholder form element attribute. Requires Prototype.js.
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.
Ratio.js
Rational numbers for Javascript
Date
Date() for humans
Length.js
📏 JavaScript library for length units conversion.
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.
Babel
Babel is a compiler for writing next generation JavaScript.
jQuery Number
Easily format numbers for display use. Replace numbers inline in a document, or return a formatted number for other uses.
Console.message
Console messages for cool kids
ES5 Shims
ECMAScript 5 compatibility shims for legacy JavaScript engines
Sprintf.js
sprintf.js is a complete open source JavaScript sprintf implementation.
Poly
Small, fast, awesome. The only ES5-ish set of polyfills (shims) you can mix-and-match because they're individual AMD modules.
HTML5shiv
This script is the defacto way to enable use of HTML5 sectioning elements in legacy Internet Explorer.
Timezone Js
Timezone-enabled JavaScript Date object. Uses Olson zoneinfo files for timezone data.