Fine Uploader is a multiple file upload plugin with image previews, drag and drop, progress bars. S3 and Azure support, image scaling, form support, chunking, resume, pause, and tons of other features.
The jQuery.ganttView plugin is a very lightweight plugin for creating a Gantt chart in plain HTML.
No vector graphics or images required. The plugin supports dragging and resizing the Gantt blocks and callbacks to trap the updated data.
LobiList is jQuery plugin for todo lists. It supports drag & drop of todos, multiple lists with different colors.
formBuilder is a jQuery plugin for drag and drop form creation.
jQuery Sortable Lists enables you to sort html list also create tree structures by mouse dragging with smooth motion, isAllowed callback or export functions and more.
A tutorial about how to create a drag and drop interface for a newsletter builder using jQuery.
Dropper is a jQuery plugin for simple drag and drop uploads.
Gridstack.js is a jQuery plugin for widget layout. This is drag-and-drop multi-column grid. It allows you to build draggable responsive bootstrap v3 friendly layouts. It also works great with knockout.js
Azexo Composer uses client JS for render of HTML to work faster and save server resources.
Treed wants to be for tree editing what ace is for text editing. Extensible, customizible, powerful, and just plain easy to use.