Jquery Ajax Form With Validation Using Php

i just want to share a list of some web forms i have used using jquery javascript web forms. these are some:

this is a good form. but currently it has no email validation
http://www.matiasmancini.com.ar/jquery-plugin-ajax-form-validation-html5.html

AJAX Form with CAPTCHA, Realtime Validation and PHP Backend - this one is really good, but the free version is limited. you have to buy the pro version
http://www.bitrepository.com/a-simple-ajax-contact-form-with-php-validation.html


http://www.webinone.net/tutorials/php/ajax-login-form-with-jquery-and-php/