Joyride is an easy to configure jQuery site tour wizard. It is extremely flexible and lets you take control of how people interact with your tour. It's cross-browser compatible with modern browsers and uses some fancy CSS to avoid images.    Joyride - Features: It works on every screen size! Edge-aware tooltips that reposition based on proximity to the edge of the window. Pause, Resume, Restart, and Destroy. Modal style tooltips (li elements without data-ids). Moved tooltip templating to

Tabby is a lightweight JavaScript and CSS kit for mobile-first toggle tabs. It's style-light so you can easily modify it to fit your design.  

GitHub & BitBucket HTML Preview provides HTML preview for GitHub repositories. It allows you to render those files without cloning or downloading whole repositories. It is a client-side solution and does not involve any third party hosting servers (except for Yahoo! Query Language to fetch assets).  

Superclick is a jQuery drop-down menu plugin, it shares many of Superfish's features and all of its CSS. However, Superclick focusses solely on click events to open and close submenus. Bear in mind, this means that links with associated submenus will never be followed, they will simply toggle the visibility of the submenu.  

kGallery is a jQuery gallery plugin that has the ability to work stable with hundreds of pictures or with big pictures, without freezing browser. This effect is achieved by retrieving the list of images from external source (JSON or XML) and downloading pictures gradually until slideshow is playing, not all in ones. This gallery plugin also includes slideshow and thumbnail componnents, which can used independently.  

slideToucher is a touch enabled jQuery plugin for content swiping. Supports vertical and horizontal swipes.   

Quovolver is a jQuery plugin for revolving multiple testimonials or quotes in your document. Although, it can also be used to cycle through any group of elements. It is a great way to display quotes, testimonials or comments on your site.  

jQuery URLive lets you easily create a live preview of any url base on its Open Graph properties and other details, similar to Facebook's post attachment.  It doesn't only work on a <textarea> or <input> it also works on <a> tag and any element with a URL on its content. It's pretty lightweight as data fetching is done asynchronously via AJAX. It also doesn't require any back-end or PHP file to crawl and get the data as it uses YQL to query and make request on other domains.  

jQuery Flip-Quote creates a pull-quote from a text quote found in the document and flips to reveal the quote once it's scrolled into view. It also has a click feature that scrolls into and highlights the quote origin on the document. The plugin optimizes CSS 3D transform and other CSS3 properties to give it a 3D depth and perspective. This has been tested on all modern browsers, for IE and older browsers the plugin also has a fallback support.  

jQuery ReSmenu is a very simple and lightweight (~1Kb) jQuery plugin that collapse <ul> menus into <select> on responsive layouts.