Description of TinyCaptcha.

Helps humankind with simpler captchas

Form protection with simple captcha calculations.

Solve Media CAPTCHA Replacement

Simple captcha image generator gem

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

A honeypot style captcha extension for ActiveRecord. Simple one-line inclusion in the model combined with a simple form field should trap the bad guys in the molasses.

ALTCHA is a free, open-source CAPTCHA alternative that protects your website from spam and abuse

Description of RailsCaptcha.

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

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

Quick little arithmetic plain-text captcha

Block repetetive requests from logged_in users and shows captcha.

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

Ruby port of VIT AutoCaptcha

SimpleCaptcha is available to be used with Rails 3 + 4 or above and also it provides the backward compatibility with previous versions of Rails.

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

0-9 arası sayıları kullanarak random olarak 2 sayı seçer ve yine random olarak toplama ya da çarpma yaparak sonucu verir.

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

Russian Post tracking toolset, consisting tracking form bot (since Russian Post is too retarded for normal API) and captcha solver/recognizer.