This is mt first gem

Helps humankind with simpler captchas

MVC based Math, Logic Captcha

RedisCaptcha provides simple captcha that can be read by human.

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

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Unobtrusive, flexible and complete spam protection for Rails applications using honeypot strategy for better user experience.

Simple gem to add captcha or negative captcha to your Rails 3 application

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

Anti-spam protection for your website

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

Implements view helpers for the ASIRRA CAPTCHA system for Rails-based websites

Simple captcha image generator gem

A captcha that uses images instead of garbled text

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

Antigate (Decode captcha service) wrapper for Ruby

Captcha form Jike API

Drop in feedback engine with customizable fields, and captcha available

generate captcha by dalli,use the memcache

Solve Media CAPTCHA Replacement