AntiCaptcha api ruby wrapper

Implements view helpers for the ASIRRA CAPTCHA system for Rails-based websites

you will get arithmatic sum with answer you just have to compare with ur user in controller

Implementation of captcha (Completely Automated Public Turing-Test to Tell Computers and Humans Apart) that is both easy to use and easy to customize/extend.

Description of TinyCaptcha.

A smart captcha library

IQ, Math Captcha

A simple and fast image captcha generator that uses opencv and memcached.

create captcha for api based project

Forked from https://github.com/kares/simple_captcha

Description of RailsCaptcha.

Anti-spam protection for your website

jQuery slide captcha system with jQuery & jQuery UI for Rails 3

Simple captcha image generator gem

Solve Media CAPTCHA Replacement

Captcha generator for rails

A captcha that uses images instead of garbled text

Define questions and answers in a YAML file and validate your models with a single line of code. No more captchas or other stupid tricks.

LoyalSimpleCaptcha is available to be used with Rails 3 or above and also it provides the backward compatibility with previous versions of Rails.

Merb plugin that provides resource access rate limits and captcha'ing