JQuery UI

jQuery UI is a collection of GUI widgets, animated visual effects, and themes implemented with jQuery (a JavaScript library), Cascading Style Sheets, and HTML. Using the Shodan search engine query term cpe:"cpe:/a:jquery/jquery_ui" we can determine that jQuery UI is used on approximately 800k web sites. Pinterest, PayPal, IMDb, HuffPost, and Netflix are utilizing the library.

Both jQuery and jQuery UI are free and open-source software distributed by the jQuery Foundation under the MIT License; jQuery UI was first published in September 2007.

As of October 7, 2021 jQuery UI is in maintenance mode, with no new features being planned.

Features
As of the 1.11.4 release, interactions such as draggable/droppable and sortable are supported. jQueryUI comes with fully themeable widgets using a consolidated, coordinated theme mechanism, such as Autocomplete, Datepicker, ProgressBar, Sliders, and more. Effects include color animations, class toggling.

Example
This makes the div with the ID "draggable" draggable by the user's mouse.