CSS Parent Selector
CSS4 parent selector based on jQuery
CSS3 Pie
A behavior for Internet Explorer allowing it to recognize and render various CSS3 box decoration properties
Typecast.js
Typecast.js :: Solving the simple problems
Char Funk
a Unicode character utility for JavaScript
Selectivizr
Selectivizr is a JavaScript utility that emulates CSS3 pseudo-classes and attribute selectors in Internet Explorer 6-8.
Placeholder Shiv
Tiny polyfill for the placeholder form element attribute. Requires Prototype.js.
Classing Js
Brings the world of classical OOP to javascript
Core Lib
A port of the Ruby 1.9.3 corelib to coffeescript/javascript/node that conforms to rubyspec.org.
Ratio.js
Rational numbers for Javascript
Object.observe
Object.observe polyfill/shim trying to be compliant
Taggd
A tool to show and add tags to images
Args.js
Create javascript functions with optional, default, grouped and named parameters.
Css3 Finalize
Tired of adding prefix for each broswer when it comes to the new css3 attributes?
Length.js
📏 JavaScript library for length units conversion.
Respond
A fast & lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more)
Numeral
A javascript library for formatting and manipulating numbers.
Yepnope.js
An Asynchronous Conditional Resource Loader