
Iliyan PeychevVotes: 13Accordion widget for YUI3.

Stephen WoodsVotes: 3Timepicker widget This is based on the very slick time picker by Maxime Haineault.
Greg HinchVotes: 2A module for managing form interaction in a page, including client-side validation, server side error processing, and asynchronous form submission.

Caridy PatinoVotes: 2Node Accordion Plugin is a light-weight solution (~3k) for expandable and collapsible elements.

Ryan GroveVotes: 3History 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.

Dav GlassVotes: 3This 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 YUI2 treeview control

Luke SmithVotes: 2Adds a DOM event "konami" that is triggered when the targeted element receives keydown strokes in the Konami code sequence.
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.

Nicholas C. ZakasVotes: 1The idle timer aims to determine when the user is idle (not interacting with the page) so that you can respond appropriately.

Luke SmithVotes: 0Adds a Y.JSONPRequest class and a Y.jsonp(url, callback) method.
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.
Jeff CraigVotes: 5Chromahash is a non-reversable password visualization module
Eric FerraiuoloVotes: 2A plugin to add modality support to Overlay. Prevents interacting with elements "under" the Overlay by masking them.
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.
Matt SniderVotes: 0Supplies 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.
Luke SmithVotes: 1node.on('drag:end', fn, config, ctx, arg1, ...argN) Adds new DOM events for "drag", "drag:start", "drag:end" and all other DD.Drag events. Full list in the docs. config obj takes Drag attributes for configuration plus supports 'proxy', 'constrained', or any other Y.Plugin.DDxxx
Eric FerraiuoloVotes: 0An extension to Y.io utility to add support for polling a server resource
Dav GlassVotes: 0A simple YUI 3 Gallery badge using the YQL Gallery Module.
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