Hello guys, Here posting some great collection of jQuery Plugins which are very useful for Web designers and Web Developers.
Agile Carousel: JQuery Carousel Plugin

Jquery plugin that allows you to easily create a custom carousel. Call Jquery UI to enable many different additional transition types and easing methods. Uses PHP to draw images from the folder you specify. Configure many different options including controls, slide timer length, easing type, transition type and more!
Ajax Tooltip script

This Ajax script enhances the default “title” attribute of HTML so certain tooltips can instead get their contents from an external file, with rich HTML content and all. Integration is easy and non obtrusive, and for the sake of efficiency, the script will only use Ajax to load the tooltip’s content the very first time the user rolls over the attached element.
Background canvas drawing plugin for round corners, gradients and tabs

BackgroundCanvas helps to decorate a semantic html/css layout. It places a <canvas> object in the background and enables drawing on this canvas object. It can be used to draw background gradients, borders and boxes with round corners, tabs and any other border or background. It’s pure JavaScript and don’t use images. It is designed to fallback gracefully to CSS if the browser don’t support JavaScript.
jQuery Easing Plugin

A jQuery plugin from GSGD to give advanced easing options.
jQuery EZ Plugins

Plugins EasySlide is a small plugins for the jQuery-JavaScript-Library . It’s designed to slide you any images inside a container . These container could be any TAG you want, e.g. <p> , <div> Easily produce your own slideshow for your website or Image . Create a Image Gallery or do an animation.
other EZ plugins are
Tinyjs – Small, but Powerful

TinyJS is a site for small, specific plugins that do one thing well. We hate bloated scripts, so lets make them as small as possible!
Gradient jQuery plugin

It allows you to define a gradient fill and have an element filled with a gradient. You can set the direction of the gradient (right-left or up-down) and the opacity of the gradient easily.
Flip – A jQuery plugin

Flip is a plugin for jquery that will flip your elements in four directions.
HoverAnim – jQuery plugin

hoverAnim make an animation on over, and return to the original position on out.
jScroller

This Autoscroller is Crossbrowser compatible and also w3c compatible, because its dont used marquee. I code this Scroller for my own Webpage, why i dont want to use the marquee Methode. Have Fun with the Scroller.
HSlides – jQuery plugin

hSlides is an horizontal accordion navigation, sliding the panels around to reveal one of interest.
jTabber for jQuery

jTabber allows you to scroll through content by clicking on tabs, without the page having to reload. The content is already on the page, you just need some javascript to tell it to display. It’s very flexible in what you’re wanting to do with it.
LavaLamp – a jQuery series plugin

LavaLamp is a plugin based on Guillermo Rauch and Ganesh Marwaha’s previous plugins for mootools and jQuery 1.1.x respectively. Using the Sliding Doors CSS / Javascript technique, LavaLamp allows you to add nifty background hover effects to HTML lists in combination with the Easing library.
Animated InnerFade with JQuery

This plugin for jQuery is an extension to the work of Torsten Baldes : InnerFade with JQuery.
They added :
- an optional slide effect on large images
- ’prev’, ’pause’, ’next’ functions
- an optional background frame
- a title panel
JQuery Curvy Corners

jQuery Curvy Corners allows you to add anti-aliased javascript based rounded corners to elements using a class name. The “Curvy corners” script was orgionally developed by Cameron Cooke, I (Mike Jolley) have since modified it for use in JQuery. The end result is a JQuery optimised file, much smaller in size, and working great!
jQuery custom selectboxes

Purpose of this plugin is very simple yet very effective. It uses jQuery to replace orginal <select> tag into fully skinable replacement. Orginal <select> tag is being hidden but changes made to replacement affect orginal too. Give it a try!
jQuery fade anything plugin

base on the fat.js which use in the wordpress, very easy to use, very pretty effect.
jQuery plugin : Fancy Zoom

This plugin is the jQuery version on the fancy zoom effect. As describe on the fancy zoom web site, this effect is providing a smooth, clean, truly Mac-like effect, almost like it’s a function of Safari itself (see the demo below).
Flop – jQuery plugin

A port of the dojox.fx.flip, a pseudo 3d effect based on a border deformation. It needs effects.core.js from jquery UI.
jQuery Touch

This plugin adds Apple iPod/iPhone (firmware 2.0+) touch functionality to jQuery. Use built in Touch methods including ontouchstart, ontouchend, ontouchmove, ongesturestart, ongesturechange and ongestureend.
Other jQuery Plugins
- Dimensions Get accurate window and document attributes across browsers.
- Equalize Columns Make columns the same height as the longest column.
- FCKEditor Plugin Adds a rich text editor to a textarea.
- Field Expand the ability to retrieve and set values in forms.
- Form Change HTML forms to submit via Ajax.
- jCodeViewer Syntax highlighting for displaying code on webpages.
- jdMenu Hierarchical Menu Generates dropdown menus.
- jEditable Live editing of elements on a webpage.
- jFeed XML feed parser.
- jPanView Replaces big images with a zoom viewer in HTML.
- jqDnR Drag’n'Resize elements on a page.
- jQMaps Interact with Google maps.
- jqModal Display notices, dialogs, and modal windows in a web browser.
- Treetable Make a tree view out of an HTML table.
- Gallery Viewer JavaScript image gallery.
- getUrlParam Function to get url parameters.
- Google Feed Plugin Display any RSS feed to a webpage.
- Gradient Adds a gradient to a div without needing an image.
- Grid Column Sizing Table column draggable resizing.
- Grid Row Sizing Expand and collapse table rows.
- hoverIntent Prevents unintended hover events.
- idTabs Add tabbed interface to a website.
- Impromptu Create modal windows and messages.
- jQuery Localisation Applies localisation packages based on the user’s language preference.
- jBox UI dialog widget.
- jCalendar Aids selecting of dates inline on a page.
- jCarousel Lite Simple carousel for images and HTML content.
- Tree View Tree view controls.
- Suggest Add autocomplete to input fields.
- YAV Form validation library.
- jqUploader Provides a status bar for uploading images.
- jScrollPane Customize your scrollbars.
- jTagEditor Turn a textarea into a tag editor.
- jVariations Create a control panel to manipulate elements on a page.
- Keyboard Navigation Dynamically determine which element to focus on based on it’s position on the screen.
- labelOver Overlay labels over an input field.
- Grid Dynamic ajax grid control.
- slideViewer Image gallery as slides.
- Spoilers Hide content behind an image until user action is taken.
- tableHover Row and column highlighting with variations.
- tableFilter Search box is added to each column header to filter table.
- tablesorter Client side table sorting.
- Taconite Easily make multiple DOM updates using the results of a single AJAX call.
- Textgrad Add gradients to whole blocks of text.
- Time Entry Sets an input field up to accept a time value.
- Tooltip Add tooltips from title page.
- Validation Add live validation to forms.
- WYMeditor Web-based XHTML WYSIWYM editor.
- Zoomi Zoomable thumbnails.
- XSLT Transform XML/XSL from JavaScript.
- XAP Ajax library.
- LavaLamp Navigation menu with a ‘lava’ effect.
- Lazy Load Only load images that are in the current window.
- Live Query Adds event listeners to elements.
- Masked Input Add mask to inputs to aid user data entry (phone numbers, etc).
- Media Unobtrusive conversion of standard markup into rich media content.
- Extra selectors for JQuery Add more selectors to jQuery.
- Mousewheel Mousewheel event handler.
- Mousehold Event Add repeating event as the user holds down the mouse.
- Multiple File Upload Select multiple files one by one as it adds to a queue list.
- newsticker Create a fading news ticker.
- Password Strength Meter Indicator to show the strength of a users password.
- PopupWindow Creates an preview popup of destination link.
- Query String Object Useful for sending URL parameters.
- Select box manipulation Remove and add options from a select list or dropdown in many ways.
- selectCombo Tool for making dependant dropdowns with Ajax.
- Star Rating Generates star rating from input fields
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Hey, nice list and thanks for adding putting us in your feature!