jQuery URLive lets you easily create a live preview of any url base on its Open Graph properties and other details, similar to Facebook's

jQRangeSlider is a powerful slider for selecting value ranges, supporting dates, touch devices and more.   jQRangeSlider

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

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

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

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with

enchant.js:  is a framework for developing simple games and applications in HTML5 + JavaScript was released in 2011, but has

Easy responsive tabs is a lightweight jQuery plugin which optimizes normal horizontal or vertical tabs to accordion

flipGallery is a free jQuery powered photo gallery with sleek flipping transitions between thumbnails and lightbox enlargements. Other features

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