jQuery UI Progressbar

Displays a status indicator for loading state, standard percentage, and other progress indicators.

jQuery UI Droppable

Enables drop targets for draggable elements.

jQuery UI Shake Effect

Shakes an element horizontally or vertically n times.

jQuery UI Button

Enhances a form with themeable buttons.

jQuery UI Slide Effect

Slides an element in and out of the viewport.

jQuery UI Puff Effect

Creates a puff effect by scaling the element up and hiding it at the same time.

jQuery UI Tabs

Transforms a set of container elements into a tab structure.

Fine Uploader

Multiple file upload library with support for all major browsers. Many features such as drag & drop, auto & manual retry, file chunking, auto-resume, and more! Does NOT use Flash or Java. Highly configurable. A no-dependency version is ALSO available in the downloads section.