Ratio.js
Rational numbers for Javascript
Args.js
Create javascript functions with optional, default, grouped and named parameters.
CSS3 Pie
A behavior for Internet Explorer allowing it to recognize and render various CSS3 box decoration properties
Svgeezy
Allows for automatic Image fallbacks for browsers that can't handle SVGs
Augment.js
Modern JavaScript in your IE
Typecast.js
Typecast.js :: Solving the simple problems
Classing Js
Brings the world of classical OOP to javascript
Placeholder Shiv
Tiny polyfill for the placeholder form element attribute. Requires Prototype.js.
Char Funk
a Unicode character utility for JavaScript
Es6 Shim
ECMAScript 6 (Harmony) compatibility shims for legacy JavaScript engines
Core Lib
A port of the Ruby 1.9.3 corelib to coffeescript/javascript/node that conforms to rubyspec.org.
Css3 Finalize
Tired of adding prefix for each broswer when it comes to the new css3 attributes?
Taggd
A tool to show and add tags to images
Respond
A fast & lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more)
ES5 Shims
ECMAScript 5 compatibility shims for legacy JavaScript engines
Object.observe
Object.observe polyfill/shim trying to be compliant
Length.js
📏 JavaScript library for length units conversion.