Tooltip

WikiUp is a jQuery plugin which gets Wikipedia descriptions in tooltips.    

sBubble is a jQuery tooltip plugin which is totally based on CSS3 for shapes and animations. There are no images used and no jQuery code used for animation. Plus some color themes are also provided.    

DTooltip is designed to be flexible and still very simple to use.    DTooltip - Features: Style the tooltip with pure CSS. Supports HTML in the tooltip. Works nicely in IE8+. Automatic handling of the psuedo elements creating the arrows.    

Toolbar.Js allows you to quickly create tooltip style toolbars for use in web applications and websites. The toolbar is easily customisable using the twitter bootstrap icons and provides flexability around the toolbars display and number of icons.   Toolbar.Js - Features: Straightforward implementation with simple options Can run as many toolbars as required Toolbars can be attached to any element required Toobar icons are easily customised through the popular twitter bootstrap framework

jQuery Tooltipify plugin creates a slide in, stylable tooltip to replace the default browser tooltip. The show and hide events are customizable.  This tooltip plugin has display awareness and also responds to the window resize event. It supports html content by using the content property.    

Bootstrap Tour makes it quick and easy to build your product tours with Twitter bootstrap popovers.    

PowerTip features a very flexible design that is easy to customize, gives you a number of different ways to use the tooltips, has APIs for developers, and supports adding complex data to tooltips. It is being actively developed and maintained, and provides a very fluid user experience.    

Simpletoolip is a Jquery plugin, thought to insert short tooltips to any element of your website more easily.   Simpletoolip - Features: Jquery based Minimal configuration 12 functional positions no extra html structures, use "title" attribute cross-browser lightweight and fast download, less than 8Kb    

jQuery Bubble Popup is a plugin to display smart, animated & shadowed, "bubble" popups or tooltips with few lines of code in jQuery.   This tooltip plugin contains many features and it is fully compatible with IE, Firefox, Chrome, Opera and Safari.