A better way to use localStorage and sessionStorage
CSS4 parent selector based on jQuery
Tired of adding prefix for each broswer when it comes to the new css3 attributes?
Small, fast, awesome. The only ES5-ish set of polyfills (shims) you can mix-and-match because they're individual AMD modules.
JS string formatter that supports objects, currency, date/time, decimals, and more supports easy extension and garbage collection ... goes far beyond sprintf approach.
Tiny polyfill for the placeholder form element attribute. Requires Prototype.js.
A lightweight engine that allows you to hitch new capabilities to the browser (prollyfill).
Allows for automatic Image fallbacks for browsers that can't handle SVGs
A behavior for Internet Explorer allowing it to recognize and render various CSS3 box decoration properties
Legacy support for the CSS3 Flexible Box Model
An Asynchronous Conditional Resource Loader