Motr.js is a project mainly written in JAVASCRIPT and RUBY, it's free.
jQuery plugin library for common functions such as text editing, form validation and misc jQueryUI alternative plugins.
motr.js is a collection of jQuery plugins designed to do two basic things:
Provide common functionality such as text editing, and form validation
Provide "native" updates to things such as forms and media elements to create browser consistent fields like number and range, and add support for html5 validation with ValidityStates.
All plugins are tested against recent versions of Chrome, Safari, and Firefox, as well as IE8 and 9. IE7 is also tested, and when at all possible supported.
See the wiki for more info.
Check out the source for various configuration options and methods.