Rails mountable engine, that provides captcha support

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.

Anti Captcha is an automated CAPTCHA solving service

Generates and verifies ascii art captcha.

API to interact with BrandCAPTCHA http://www.pontamedia.com/en/brandcaptcha/

This gem enable to use Captchme. Anti spam, Monetize captcha and Audience qualification

Wrapper for Captchabot.com

dongsx

generate captcha by dalli,use the memcache

IQ, Math Captcha

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

MVC based Math, Logic Captcha

create captcha for api based project

Quick little arithmetic plain-text captcha

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

RMagickCaptcha is a gem that implements captcha for using in Rails application.