JavaScript

Project: https://github.com/chuckcarpenter/REM-unit-polyfill
Website: http://chuckcarpenter.github.io/REM-unit-polyfill/

The polyfill will test any browser for REM support and patch it up if needed, although we all know IE8 and below is where the issue lies. Once lack of support is determined, it reads all the link tags for stylesheets and finds selectors that have rules using the REM unit. It then recalculates those rules to PX and writes them in the head to override in the cascade. Magic.

Project: https://github.com/ftlabs/fastclick
Website: none

FastClick is a simple, easy-to-use library for eliminating the 300ms delay between a physical tap and the firing of a click event on mobile browsers. The aim is to make your application feel less laggy and more responsive while avoiding any interference with your current logic.

Project: https://github.com/aFarkas/html5shiv
Website: n/a

This script is the defacto way to enable use of HTML5 sectioning elements in legacy Internet Explorer. The HTML5 Shiv enables use of HTML5 sectioning elements in legacy Internet Explorer and provides basic HTML5 styling for Internet Explorer 6-9, Safari 4.x (and iPhone 3.x), and Firefox 3.x.

Project: https://github.com/scottjehl/Respond
Website: none

A fast and lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more). The goal is to enable responsive web designs in browsers that don’t support CSS3 Media Queries – in particular, Internet Explorer 8 and under. It’s written in such a way that it will probably patch support for other non-supporting browsers as well.

Project: https://github.com/WickyNilliams/headroom.js
Website: http://wicky.nillia.ms/headroom.js/

Headroom.js is a lightweight, high-performance JS widget (with no dependencies) that allows you to react to the user’s scroll. The header slides out of view when scrolling down and slides back in when scrolling up.