Xregexp
Extended JavaScript regular expressions
Big.js
A small, fast JavaScript library for arbitrary-precision decimal arithmetic.
Decimal.js
An arbitrary-precision Decimal type for JavaScript
Tiny Color
Fast, small color manipulation and conversion for JavaScript
Dayjs
⏰ Day.js 2KB immutable date library alternative to Moment.js with the same modern API
Store
A better way to use localStorage and sessionStorage
CSS3 Pie
A behavior for Internet Explorer allowing it to recognize and render various CSS3 box decoration properties
Augment.js
Modern JavaScript in your IE
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?
Char Funk
a Unicode character utility for JavaScript
Nerdamer
a symbolic math expression evaluator for javascript
Placeholders.js
A JavaScript polyfill for the HTML5 placeholder attribute
Yepnope.js
An Asynchronous Conditional Resource Loader
HTML5shiv
This script is the defacto way to enable use of HTML5 sectioning elements in legacy Internet Explorer.
Inversify Js
A powerful and lightweight inversion of control container for JavaScript & Node.js apps powered by TypeScript.
Xdate
A Modern JavaScript Date Library