21 Free CAPTCHA Sources

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Here is a collection of free CAPTCHA scripts and services than you can easily integrate into your website using PHP or JavaScript: 1. PHP CAPTCHA Library for reCAPTC

jQuery Fancy Draggable Captcha

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Here is a jQuery example for a captcha in a registration form. In order to pass the “Are you human” test, the user has to drag the numbers from 1 to 6 in