Stringformatter
JS string formatter that supports objects, currency, date/time, decimals, and more supports easy extension and garbage collection ... goes far beyond sprintf approach.
Dayjs
⏰ Day.js 2KB immutable date library alternative to Moment.js with the same modern API
Hitch
A lightweight engine that allows you to hitch new capabilities to the browser (prollyfill).
Date
Date() for humans
HTML5shiv
This script is the defacto way to enable use of HTML5 sectioning elements in legacy Internet Explorer.
ES5 Shims
ECMAScript 5 compatibility shims for legacy JavaScript engines
Angled Edges
:triangular_ruler: Quickly create angled section edges using only Sass
Yepnope.js
An Asynchronous Conditional Resource Loader
Respond
A fast & lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more)
Sugar
A Javascript library for working with native objects.
Moment
Parse, validate, manipulate, and display dates in javascript.
Flexie
Legacy support for the CSS3 Flexible Box Model
Decimal.js
An arbitrary-precision Decimal type for JavaScript
Datejs
Datejs is an open-source JavaScript Date Library.
Mathjs
An extensive math library for JavaScript and Node.js
Underscore String
String manipulation extensions for Underscore.js javascript library.
Console.message
Console messages for cool kids