Klass
a utility for creating expressive classes in 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
Typecast.js
Typecast.js :: Solving the simple problems
Nerdamer
a symbolic math expression evaluator for javascript
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
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
Css3 Finalize
Tired of adding prefix for each broswer when it comes to the new css3 attributes?
Respond
A fast & lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more)
Tiny Color
Fast, small color manipulation and conversion for JavaScript
Es6 Shim
ECMAScript 6 (Harmony) compatibility shims for legacy JavaScript engines
Length.js
📏 JavaScript library for length units conversion.
Dayjs
⏰ Day.js 2KB immutable date library alternative to Moment.js with the same modern API
ES5 Shims
ECMAScript 5 compatibility shims for legacy JavaScript engines