Apprise is the new and improved attractive alert alternative for jQuery. And the options can be changed to suit your requirements

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

Text Effects is a sci-fi style awesome effect made with jQuery. As a jQuery plugin, you can simply implement the effect

annyang is a javascript library for adding voice commands to your site, using speech recognition. This javascript speech recognition

jQuery Upload File plugin provides multiple file uploads with progress bar. Works with any server-side platform (Google App

Photobox is a lightweight image gallery modal window script which uses only CSS3 for silky-smooth animations and transitions, utilizes

jQuery++ provides jQuery's missing utils and special events. It is a MIT licensed collection

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

DyLay is a jQuery plugin which allows to create dynamic layout very easily. It respects order of elements.   

SergeLand Image Zoomer is a jQuery plugin for zooming images with stylish and smooth magnifying glass effects.