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

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

NO LONGER MAINTAINED AND NOT RECOMMENDED, AS BOTS ARE ABLE TO RESOLVE CAPTCHAS BETTER THAN HUMANS. Based on Login Attempts check if captcha is necessary. It stores a permanent cookie and uses a table for tracking login requests.

Simple, easy captcha for Sinatra

Solve Media CAPTCHA Replacement

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

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

Simple captcha image generator gem

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

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

This library can help you create a captcha in your terminal application, which may be damaged by a large influx of requests.

Gem that uses RuCaptcha API to solver any type of captcha

Description of RailsCaptcha.

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

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

create captcha for api based project

MVC based Math, Logic Captcha

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