Avgrund is a jQuery plugin for modal boxes and popups. It uses interesting concept showing depth between popup and page. It works in all modern browsers and gracefully degrade in those that do not support CSS transitions and transformations.  

ScrollIt.js is a jQuery plugin that makes it easy to create paginated, feature vertically scrolling pages.    ScrollIt.js - Features: Easy to implement: One JS call, just put data- attributes on the DOM Lightweight Active Class: Your navigation is updated automatically Configurable: Set the animation easing, duration, callbacks and more Keyboard Navigation: Press the up and down keys to move  

iView is easy to use jQuery image slider with animated captions, responsive layout and HTML Elements like (Video, iFrame) slider. Easily add unlimited number of slides and captions. Use it as image slider, image gallery, banner rotator, banner ads, or even presentation.   iView - Features: jQuery Capabilities. Responsive down to mobile (applies for slider area and images). Touch gestures navigation for iOS, Android and other touch devices. Highly Flexible and Customizable. Highly User Int

Menutron is a jQuery plugin for responsive navigation menus. It transforms your navigation menus from a list to a select menu when resizing your browser. On mobile devices, the select menu pulls up a native control, making it easier to pick an item.   Menutron - Features: concise – When implemented in a responsive design, your menu becomes consolidated in to a single control, saving you horizontal and/or vertical real-estate. convenient – On mobile devices, the select controls will activate

Gridster.js is a jQuery plugin that makes building intuitive draggable layouts from elements spanning multiple columns. You can even dynamically add and remove elements from the grid.  

Adaptor is a light-weight content slider that aims to provide a simple interface for developers to create cool 2D or 3D slide animation transitions.  

jQuery Flip Plugin is a jQuery/jQuery mobile plugin to give Flipboard app like effect. Flip effect uses css 3d transform. Flip effect currently works on WebKit browsers (e.g. Chrome, Safari, including iOS mobile safari) or Firefox 11. It still works with other browsers but the "slide" effect will be selected forecely.  

Really Simple Slideshow is a jQuery plugin for creating image slideshows. Images are loaded dynamically as each one is required, allowing for larger slideshows without having to pre-load lots of images. Captions can be added and slide images can be made clickable, simply by adding to the HTML.  

malihu custom scrollbar plugin is a highly customizable custom scrollbar jQuery plugin.   malihu custom scrollbar plugin - Features: Vertical and/or horizontal scrollbar(s) Adjustable scrolling momentum Mouse-wheel, keyboard and touch support Ready-to-use themes and customization via CSS RTL direction support Option parameters for full control of scrollbar functionality Methods for triggering actions like scroll-to, update, destroy etc. User-defined callbacks  

Ion.RangeSlider is an easily customizable jQuery range slider. It has flexible settings and can be completely altered with CSS.   Ion.RangeSlider - Features: Skin support. (3 skins included and PSD for skin creation) Any number of sliders at one page without conflicts and big performance problems Two slider types single (1 slider) and double (2 sliders) Support of negative and fractional values Ability to edit step Support of custom values diapason  Automatically generated grid Ability