IQ, Math Captcha

Helps humankind with simpler captchas

Description of TinyCaptcha.

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

This is a gem wrapper for tiny captcha in C with no dependencies.

Integrate the AreYouAHuman.com CAPTCHA alternative human verification into your Ruby/Rails application

RedisCaptcha provides simple captcha that can be read by human.

Death by Captcha Ruby implementation (HTTP API)

Simple lib to generate a math_captcha to prevent spammers in form. Supports localization.

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

Simple, easy captcha for Sinatra

Solve Media CAPTCHA Replacement

Quick little arithmetic plain-text captcha

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

This plugin adds helpers for the YinXiangMa CAPTCHA API

This is mt first gem

A simple image captcha gem

Gem that uses RuCaptcha API to solver any type of captcha

dongsx

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