⏰ Day.js 2KB immutable date library alternative to Moment.js with the same modern API
Object.observe polyfill/shim trying to be compliant
autoNumeric is a jQuery plugin that automatically formats currency (money) and numbers as you type on form inputs. It supports most International numeric formats and currency signs including those used in Europe, North and South America, Asia and India (lakhs**).
Legacy support for the CSS3 Flexible Box Model
Small, fast, awesome. The only ES5-ish set of polyfills (shims) you can mix-and-match because they're individual AMD modules.
A lightweight engine that allows you to hitch new capabilities to the browser (prollyfill).