CAPTCHA is an easy method, which are designed to differ between human and bots or malicious software to keep them away. Proposing CAPTCHA to your comment forms, registration & logins forms, contact forms, etc.
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 8 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.
QapTcha is an easy-to-use, simple and intuitive captcha system.
It needs human action instead of to read a hard text and it is a very lightweight jQuery plugin.
This tutorial is about ajax based contact form with jquery validation and ajax based captcha. Captcha is main part of any form and if it is ajax based then it looks awesome.
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.