Ajax Autocomplete for jQuery allows you to easily create autocomplete/autosuggest boxes for text input fields.

Another example of what I call primary research in HTML5, CSS & JavaScript:

FFF is a collection of interactive experiences. Each experience has its own unique design and functionality. All the experiences are created in HTML5, the site works beatifully on both desktop and tablet.

A fully responsive and lightweight jQuery dateinput picker

Via @Zraly

A powerful slider for selecting value ranges, supporting dates and more.

Touch support included.

jQuery plugin for simple but powerful sprite based animations and panning

This pure javascript library allows you to do simple A/B testing working only on your client-side code. All data is registered as custom variables in your website Google Analytics profile, so you don’t need to configure anything server side.

Shapeshift is like Masonry but with drag & drop. Touch support included.

4 kb of uncompressed JavaScript allows you to use <input type="color"> even for IE6+.

Nice collection of jQuery plugins with search. (Though I would prefer tags.)

Via @elfineer

Nice work by Kiandra team.

Good lists – part 1, part 2 – by Smashing Magazine. As always, if you are looking for something more specific, try searching my Zootool bookmarks.

Trevor Davis made this plugin that allows you — surprise, surprise – to stick any element so it does not scroll off the view.

An opensouce library that brings database features into your JavaScript applications.

  • Small file size, extremely fast queries
  • Powerful JavaScript centric data selection engine
  • Database inspired features such as count, update, and insert
  • Robust cross browser support
  • Easily extended with your own functions
  • Compatible with any DOM library (jQuery, YUI, Dojo, etc)
  • Compatible with Server Side JS

Via WebAppers

Hakim strikes again, now with 3D menu concept. Just move your cursor to the left side of the page.

Lightweight JavaScript library to draw graphs, using the HTML canvas element.

Mr. Matteo Spinelli created nice add-to-home-screen script that may be useful to you if you have a mobile web app and want to let your users know, they could add it to their home screens.
That then allows your app to look like native app from their point of view.

Quick and easy way to build your product tours with Twitter Bootstrap Popovers.

HTML5 Sortable is a jQuery plugin to create sortable lists and grids using native HTML5 drag and drop API.

Works in IE 5.5+, Firefox 3.5+, Chrome 3+, Safari 3+, and Opera 12+.

A super simple notification system for jQuery

Or you may like noty.

Via @elfineer

Great tutorial by Mary Lou of Codrops.