Free jQuery Captcha Plugins
All the Free jQuery Plugins about 'Captcha' are listed here.
IconCaptcha is a simple, flexible, customizable, user-friendly, jQuery & PHP based captcha plugin to prevent spam and bots on your web app.
A simple captcha plugin that creates a canvas-based alphanumeric captcha widget to test if your visitor is a bot or a human.
noSpamQuiz.js is a jQuery plugin to stop comment spam in your website that automatically hides and reveals the comment form depending on whether the visitor answered the correct question(s). Similar to the Captcha Verification.
A customizable, user-friendly, jQuery & PHP based icon Captcha plugin created for preventing spam on forms, with support for server-side validation and custom events.
An ultra-light (less than 1kb) jQuery Math Captcha plugin that is easy to integrate into your webpage for preventing spam on forms.