Kaiten is an impressive jQuery plugin for creating a flexible, simplistic and powerful browsing experience.

It helps quickly-building a column-based interface where each column can be a part of a sequence (like a breadcrumb navigation) and resized by the end-user.

The interface auto-arranges itself according to the browser-width by changing the number of the columns displayed. Simply, it will perform nicely on mobile and tablet browsers.

Kaiten can be extended very easily with its API. The plugin is also well-documented and comes with a demo that shows its features.

The plugin is included in a new web app platform named Officity and in alpha stage (yet very promising).

DomSearch.JS is a jQuery plugin that simplifies searching the DOM and filtering results.

Using the plugin, we can target an element (like a list or a table) and search values inside it. Once found, the irrelevant results will be hidden automatically leaving the results visible.

It makes use of LiquidMetal (a scoring algorithm) for a very fast search specially in long lists.

TinyBox2 is the successor of the previously published resource TinyBox which is a standalone JavaScript modal windows library.

The library is lightweight (5kb) and supports images, iframes, HTML and Ajax requests natively.

Modal windows are very flexible with the options like toggle animation, auto-hide, opacity level, custom positions and more.

And, they can be closed by simply clicking on the close button, anywhere outside the modal box or ESC.

There are callback functions for the open + close events and the windows can be set to load in a specific size or the width/height (auto) of the content to be displayed.

UI.Layout is a jQuery plugin for creating almost any type of desktop-like user interfaces with menus, status bars, toolbars and more.

The panels created are totally customizable. They are collapsable, hidable, resizable and slidable.

Every panel can have its own headers/footers, can be managed with the help of hotkeys and any HTML element can be used inside them.

There are callbacks provided on every level and lots of methods exist for a complete control.

It can also work with jQuery UI components in harmony to create totally advanced layouts.

Isotope is an impressive jQuery plugin that enables us to sort items and create smart layouts.

Using the plugin, any given list of items can be filtered with show/hide effects and they can be re-ordered with slick animations.

The plugin's layout features are very powerful as well. With a simple function, items can be converted into horizontal/vertical layouts or arranged intelligently within a grid and much more. And, all with nice animations.

Isotope’s animation engine takes advantage of the best browser features when available — CSS transitions and transforms, GPU acceleration — but falls back to JavaScript animation when they are not available.

zClip is a jQuery plugin for creating a "copy to clipboard" functionality with the help of an invisible Flash Movie.

It is built using the popular Zero Clipboard library + totally compatible with Flash 10 and below.

The library is lightweight (~7kb) and has support for CSS ":hover" + ":active" states.

zClip works by transparently overlaying the Flash movie over an element yet it keeps this targeted element's "click" "mouseenter" and "mouseleave" events.

Also, 2 callback functions: "before copy" and "after copy" allow you handle the requests better.

CeraBox is a stable and easy-to-use Lightbox-alternative that is built with MooTools.

It can display images, SWF files or any other HTML + load iframes and make Ajax requests.

The script can group images to be presented as a gallery where they can be browsed with prev-next buttons.

And, title tags can be used to show extra information about each image.

As a last handy feature, CeraBox can be set to a fixed size or resize itself according to the sizes of the items being loaded.

Zoomy is a very easy-to-implement jQuery plugin which helps creating zoom-to-image functionality.

Besides the thumbnail, It requires a bigger size of an image to display the part being zoomed.

It comes with several options like the zoom size, whether it'll be rounded or not and image being clickable or not.

There is also a nice loader being displayed while waiting for the zoom to load.

jNotify is a jQuery plugin for displaying animated notifications easily and only with a single line of code.

There are 3 built-in notification types: information, success and failure where each of them can be skinned via CSS.

The plugin is very flexible and has many options like the position of the messages, opacity of the overlay, duration of the effects, whether it will be hidden automatically or not and much more.

Also, 2 callbacks (onCompleted and onClosed) help interacting with the functionality better.

jQuery UI is a great addition to jQuery JavaScript framework with the widgets and customization it offers.

If you're looking for alternative widgets, Wijmo, which is a set of 30 items, can be the one.

It has 2 versions where the "Open" version has ~15 free to use items and the "Complete" version, which is commercial (or free for GPL licenses apps), includes the full set.

Wijmo's "Open" version has many frequently used widgets like accordion, calendar, progress bar, slider, tabs, tooltip and more.

They make use of the jQuery UI CSS Framework and they are Themeroller-ready.