Simple negative captcha for Rails

anti-captcha is a Ruby library for recognize captcha on anti-captcha.com

BrainBuster - a logic captcha for Rails

A Google-style captcha for enterprise Rails apps

A Google-style captcha for enterprise Rails apps

This version include two important page 'Contact' and 'Register' with the 'Math-Captcha' method submit for prevent hacker attack.

Repackaged visualCaptcha's backend service, including translation and minor modification. Mainly for private use. Everything still belongs to original author: emotionLoop.

This plugin adds helpers for the YinXiangMa CAPTCHA API

Simple, easy captcha for Sinatra

Description of RailsCaptcha.

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

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

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

Quick little arithmetic plain-text captcha

IQ, Math Captcha

A simple image captcha gem

dongsx

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

A smart captcha library

RedisCaptcha provides simple captcha that can be read by human.