A gem to generate captcha pictures.

generate captcha by dalli,use the memcache

A simple way to add zero friction captchas to Rails forms

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

It's a Rails Captcha Engine for Rails 3 applications.

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

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.

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

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

This plugin adds helpers for the YinXiangMa CAPTCHA API

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

My version of SimpleCaptcha

HumanDetector is a friendly logic captcha for Rails the doesn't require any external system dependency (e.g. external captcha API connections). It uses a simple question that any 7 or more years old human can understand, but that a spambot will not be able to answer. This Gem supports Ruby v1.9.2 and Rails 3.0.x.

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

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

MVC based Math, Logic Captcha

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

This is mt first gem

IQ, Math Captcha