Responsive Nav is a tiny JavaScript plugin which helps you to create a toggled navigation for small screens. It uses touch events and CSS3 transitions

SlidesJS is a responsive slideshow plug-in for jQuery with features like touch, CSS3 transitions, looping, auto play, fade or slide transition effects

jQuery.pin is great for pinned navigations and anything you want to stick. It pins any element within a container. Easily disable it

Highlight Search Terms is a jQuery plugin which highlights search terms in referrer URL from Google, Yahoo, Bing

Pronto is a jQuery plugin for faster page loads.   Building on concepts like 

FormHelp is a jQuery utility plugin providing contextual help on input fields in a form. FormHelp provides contextual help

gmaps.js allows you to use the potential of Google Maps in a simple way.  

jQuery.naviDropDown is a simple jQuery plugin which allows you to create a simple drop down menu, utilising hoverIntent

ScrollStory is a jQuery UI widget for building simple, scroll-based pages and interactions. Key features include:

Avgrund is a jQuery plugin for modal boxes and popups. It uses interesting concept showing depth between popup and page.