List of Free code jQuery AutoComplete
Replaces Symphony CMS' default tag list suggestions with a jQuery autocomplete widget.
A jQuery Mobile autocomplete plugin.
jQuery Geocoding and Places Autocomplete Plugin.
jquery autocomplete inner
Shows in an example how to use autocomplete of JQuery inside a textarea, so that the word before the cursor will used for the lookup.
A jQuery autocomplete plugin for the discerning developer.
jQuery Smart Auto Complete
AutoComplete plugin with smart defaults and flexibility to customize.
Selectize is the hybrid of a textbox and <select> box. It's jQuery based and it has autocomplete and native feeling keyboard navigation; useful for tagging, contact lists, etc.