Char Funk
a Unicode character utility for JavaScript
Sprintf.js
sprintf.js is a complete open source JavaScript sprintf implementation.
jQuery Number
Easily format numbers for display use. Replace numbers inline in a document, or return a formatted number for other uses.
Augment.js
Modern JavaScript in your IE
Taggd
A tool to show and add tags to images
Big.js
A small, fast JavaScript library for arbitrary-precision decimal arithmetic.
Placeholder Shiv
Tiny polyfill for the placeholder form element attribute. Requires Prototype.js.
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
Klass
a utility for creating expressive classes in JavaScript
Hitch
A lightweight engine that allows you to hitch new capabilities to the browser (prollyfill).
Args.js
Create javascript functions with optional, default, grouped and named parameters.
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**).
Css3 Finalize
Tired of adding prefix for each broswer when it comes to the new css3 attributes?
CSS Parent Selector
CSS4 parent selector based on jQuery
Placeholders.js
A JavaScript polyfill for the HTML5 placeholder attribute
Numeral
A javascript library for formatting and manipulating numbers.