Cloudinary
Cloudinary streamlines your web application’s image manipulation needs. Cloudinary's cloud-based servers automate image uploading, resizing, cropping, optimizing, sprite generation and more. Cloudinary's jQuery plugin allows direct uploading from the browser to the cloud and dynamic cloud-based image transformations and effects.
Sebastian Tschan
File Upload widget with multiple file selection, drag&drop support, progress bar, validation and preview images, audio and video for jQuery. Supports cross-domain, chunked and resumable file uploads. Works with any server-side platform (Google App Engine, PHP, Python, Ruby on Rails, Java, etc.) that supports standard HTML form file uploads.
jQuery mnmenu, simple dropdown menu
Marc Nuri
jQuery plugin to create dropdown menus from ul lists.
Andres
jQuery plugin to sort and reorder table columns by using drag and drop
Matthew Eagar
Drag and drop items between two lists, with multi-select and keyboard shortcuts