Taggle.js allows you to create tag fields within your forms, to allow for easy and optionally restricted, input from your users.
SVG 3D Tag Cloud is a lightweight jQuery plugin that creates a three dimensional tag cloud. Easy to use, no dependencies. No additionals plugins. Fully customizable.
Tagsort is a jQuery plugin that uses HTML5 data attributes to dynamically create interactive tags that can be used to filter and sort a set of tagged elements..
inputTags.js is a simple jQuery plugin allowing to add, edit or remove tags in a tags list.
Insignia is a customizable tag input that is progressively enhanced, fast, easy to use, and reliable.
Tagator is a jQuery-based replacement for input boxes, making them tagging boxes. It supports searching, and affects the original input box directly, which is used as a comma serparated data container.
Tag Editor is a powerful and lightweight tag editor plugin for jQuery.
taggingJS is a jQuery plugin to create an high customizable front-end tag system. It is less than 2.5 kb and support major browsers in the world!
jQuery.masterblaster is a nice and tidy tag manager.
Taggd is a jQuery plugin that help you create tags on images with, or without a popup!
Selectize is a jQuery-based custom
<select> UI control. It's useful for tagging, contact lists, country selectors, and so on. It clocks in at around ~7kb (gzipped). The goal is to provide a solid & usable user-experience with a clean and powerful API.