Generates and verifies ascii art captcha.

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.

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

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.

这是一个验证码生成器。基于rucaptcha。本人只是将他的源码拉下来。为我的网站进行适配。因为我不使用sesion.id

Easy to use classical captcha for Rails apps

A gem to generate captcha pictures.

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

Simple captcha

IQ, Math Captcha

Description of RailsCaptcha.

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

Solve Media CAPTCHA Replacement

A captcha that uses images instead of garbled text

This plugin adds helpers for the YinXiangMa CAPTCHA API

Helps humankind with simpler captchas

Form protection with simple captcha calculations.

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

Google reCaptcha helpers and verifier

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