It is a smart way to keep bots out from entering in to the website. CAPTCHA helps to curb the unethical activities and to give the spammers a hard time and it saves lot of time against managing spam comments for a blog, deleting fake spam users registering in sites, stop posting spam advertisements and things very much alike.
Here’s we are presenting Free jQuery CAPTCHA Plugin Solutions To Prevent Spam that you can use to provide protection from spam bots and ensure that only humans perform certain actions.
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It is an advanced plugin script that asks for choosing the correct image instead of asking to recognize the difficult text.
MotionCAPTCHA is a jQuery CAPTCHA plugin, based on the HTML5 Canvas Harmony procedural drawing tool by Mr Doob and the $1 Unistroke Gesture Regonizer algorithm (and the more recent Protractor algorithm improvement), requiring users to sketch the shape they see in the canvas in order to submit a form.
jQuery fancy Draggable Captcha - 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 into order.
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Jquery Advanced Ajax validation with CAPTCHA - The plugin is written and maintained by Jörn Zaefferer, a member of the jQuery team, lead developer on the jQuery UI team and maintainer of QUnit.
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Simple Captcha - This plugin is designed to help overcome automated form submission by requiring a "real person" to identify text made up of dots. The entered value is compared on the server with the generated value to determine whether processing should continue.