Fresco is a beautiful responsive lightbox.  It can be used to create stunning overlays that work great at any screen size, in all browsers

Chosen is a jQuery plugin that makes long, unwieldy select boxes much more user-friendly.  

kGallery is a jQuery gallery plugin that has the ability to work stable with hundreds of pictures or with big pictures, without freezing

JointJS is a modern HTML 5 JavaScript library for visualization and interaction with diagrams and graphs. It can be used to create either static diagrams

ayaSlider is a flexible jQuery slider plugin.   ayaSlider - Features: Embed Any HTML Element Animate

Slickhover.js is a lightweight useful jQuery plugin that produces a slick and smooth hover effect that fades out images and shows

elementTransitions.js is a wrapper around the code provided by a 

Freeow! is a plugin for making Growl-like alerts or message boxes on your website. You can customize the look and animation of

Super Simple Text Rotator is a light weight jQuery plugin that will allow you to add a super simple rotating text to your

vTicker is a jQuery plug-in that adds scrolling vertical tickers to your site. Just one line of javascript code is all you need to