Selectize is the hybrid of a textbox and <select> box. It's jQuery-based and it's useful for tagging, contact lists, country selectors, and so on.   Selectize.js - Features: Skinnable — Comes with LESS stylesheets and shims for Bootstrap 2 and Bootstrap 3 (+ precompiled CSS). Clean API & Code + Extensible — Interface & make addons like a boss with the plugin system. Fully documented on GitHub & inline. Smart Ranking / Multi-Property Searching & Sorting — Want to search

Multiple select is a jQuery plugin to select multiple elements with checkboxes :). Multiple select - Features: Default option allows to show checkbox. Ability to grouping elements. Supports to show multiple items in single row. Select all options. Feature to show placeholder.    

jCarousel Lite is a jQuery plugin that carries you on a carousel ride filled with images and HTML content. Put simply, you can navigate images and/or HTML in a carousel-style widget. It is super light weight, at about 2 KB in size, yet very flexible and customizable to fit most of our needs.    

Conveyor-Belt is a simple but well adjustable slideshow carousel jQuery plugin. There are plenty of configurations available, including transition types, image fits and slideshow speeds.    

blueimp Gallery is a touch-enabled, responsive and customizable image & video gallery, carousel and lightbox, optimized for both mobile and desktop web browsers. It features swipe, mouse and keyboard navigation, transition effects, slideshow functionality, fullscreen support and on-demand content loading and can be extended to display additional content types.    

jQuery Open Carousel is an open and easy to implement carousel display made using jQuery. It supports linking to scroll to any slide, automatic generation of indicator circles, and pretty much any content will work inside of it. Multiple carousels can exist on one page without conflict. Many configuration options can be set dynamically using data attributes.    

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    

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.    

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

Tag Manager is a jQuery plugin to create tag input fields, which works nicely with Twitter Typeahead.js and Twitter Bootstrap.