Brian Reavis
Selectize is a jQuery-based custom <select> UI control. Useful for tagging, contact lists, country selectors, etc.
Nick Palmer
jQuery plugin to turn a HTML select into an auto-suggesting, tagging widget
Igor Vaynberg
Select2 is a jQuery based replacement for select boxes. It supports searching, remote data sets, and infinite scrolling of results.
TagCanvas HTML5 canvas tag cloud
Displays tags as a 3D rotating tag cloud using an HTML5 canvas
Nicolas Bize
MagicSuggest is a multiple selection auto suggest combo box for Bootstrap 3.