Jarallax is an open-source javascript library which makes adjusting css based on interaction easy. With Jarallax it's easy to create a parallax scrolling website.
CSSrefresh is a small, unobstructive javascript file that monitors the CSS-files included in your webpage. As soon as you save a CSS-file, the changes are directly implemented, without having to refresh your browser.
Responsive Measure is a simple script that allows you to pass in a selector (ideally the container where your primary content will go) which generates the ideal font size needed to produce the ideal measure for your text.
Really Simple Slideshow is a jQuery plugin for creating image slideshows. Images are loaded dynamically as each one is required, allowing for larger slideshows without having to pre-load lots of images.