jQuery Real Person

This plugin enhances an input field to help reduce automated form submission. * Server-side scripts for PHP, Java, C#, ColdFusion, Rails, Python.

ebcaptchaword

A simple and lightweight jQuery plugin for generating and implementing captcha inside a form

jQuery SimpleCaptcha

Easy-to-use and understand captcha implementation.

jQuery Captcha99

Throws user a simple Math problem to identify humans from bots.

edoncaptcha

A simple, lightweight jQuery plugin for generating, implementing captcha inside a form

ebcaptcha

A simple and lightweight jQuery plugin for generating and implementing captcha inside a form