3 JQuery Suggestion Box Plugins

Tipue drop is a search suggestion box jQuery plugin.Tipue drop only needs a browser that supports jQuery. Tipue drop is responsive and works on all reasonably modern browsers. .....
Forms Plugins Responsive

Suggestion Box is a simple, flexible, customizable jQuery plugin for displaying a Google-style suggestion box under the search field while user is typing......
search autosuggest

A jQuery Facebook Friend Autocomplete plugin that provides a facebook-like friend suggestion box while a currently facebook logged in user types into the input field......
Autocomplete Facebook suggestion-box