
Iliyan PeychevVotes: 15Accordion widget for YUI3.

Stephen WoodsVotes: 3Timepicker widget This is based on the very slick time picker by Maxime Haineault.
Greg HinchVotes: 0A module for managing form interaction in a page, including client-side validation, server side error processing, and asynchronous form submission.

Caridy PatinoVotes: 14Node Accordion Plugin is a light-weight solution (~3k) for expandable and collapsible elements.

Dav GlassVotes: 5This module adds a little sugar to YUI3 to make simple easy YQL queries.

Dav GlassVotes: 0This is a non-supported port of SimpleEditor from YUI2.x.
Adam MooreVotes: 1An unsupported port of the YUI 2 treeview control

Ryan GroveVotes: 4History Lite is similar in purpose to the YUI Browser History module, but with a more flexible API, no initialization or markup requirements, limited IE6/7 support, and a much smaller footprint.

Luke SmithVotes: 3Adds a DOM event "konami" that is triggered when the targeted element receives keydown strokes in the Konami code sequence.

Luke SmithVotes: 0Adds a Y.JSONPRequest class and a Y.jsonp(url, callback) method.
Dav GlassVotes: 0This little module adds the ability to use the tab key inside of a textarea. Currently it doesn't support Opera and it doesn't support text-selection tabbing.
Josh BricknerVotes: 1YUI HTML5 Player is a YUI 3 widget that creates a video player using the HTML5 video tag and JavaScript that is based on YUI 3. It was started as entry to the YUI 3 Gallery Contest in March 2010.

Ryan GroveVotes: 1Lightweight API for persistent cross-browser local key/value storage similar to the HTML5 localStorage API. Supported browsers include IE6+, Firefox 2+, Safari 3.1+, Chrome 4+, and Opera 10.5+. No browser plugins required (not even Flash).

Nicholas C. ZakasVotes: 3The idle timer aims to determine when the user is idle (not interacting with the page) so that you can respond appropriately.
Eric FerraiuoloVotes: 4A plugin to add modality support to Overlay. Prevents interacting with elements "under" the Overlay by masking them.
Dav GlassVotes: 0A simple YUI 3 Gallery badge using the YQL Gallery Module.
Luke SmithVotes: 1Adds Y.Twitter.Status widget for Twitter status updates. Configure how many to display, from what twitter user (public only), and how frequent to poll for updates.
Jeff CraigVotes: 4Chromahash is a non-reversable password visualization module
Caridy PatinoVotes: 9The YUI2 Wrapper Utility makes it easy to transform existing YUI 2 code into YUI 3 compatible code, using lazy load to include the required yui2 modules leveraging YUI 2 Loader Utility.
Matt SniderVotes: 1Supplies sorely needed number evaluation and manipulation utilities. This adds additional functionality to what is provided in yui-base, and the methods are applied directly to the YUI instance. This module is useful for sites that need to manipulate or evaluate numbers.
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