jQuery TextExt Plugin : TextExt is a plugin for jQuery which is designed to provide functionality such as tag input and autocomplete.
jQuery Google Analytics Custom Events : jQuery GACE is a plugin for tracking custom events in your web page. It provides a simple wrapper for some custom elements.
hoverIntent jQuery Plug-in : hoverIntent is a plug-in that attempts to determine the user's intent... like a crystal ball, only with mouse movement! It is similar to jQuery's hove...
Select2 : Select2 is a jQuery based replacement for select boxes. It supports searching, remote data sets, and infinite scrolling of results.