Free jQuery hint Plugins
All the Free jQuery Plugins about 'hint' are listed here.
Progression is an useful and user-friendly jQuery plugin that gives users real time hints & progress updates as they complete forms.
Form Toolltip is a minimal JQuery plugin that displays animated & customizable hint boxes/tooltips next to the form fields while typing.
Coolinput is a lightweight jQuery input hint plugin that adds a default value to the input filed with a lot of custom options, mimics html5 placeholder attribute for old browsers like IE7, IE8, etc.