Define questions and answers in a YAML file and validate your models with a single line of code. No more captchas or other stupid tricks.

RubyGem package for visualCaptcha's backend service

This plugin adds helpers for the YinXiangMa CAPTCHA API

A captcha that uses images instead of garbled text

Block repetetive requests from logged_in users and shows captcha.

Captcha generator for rails

My version of SimpleCaptcha

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

Ruby port of VIT AutoCaptcha

Solve Media CAPTCHA Replacement

Ruby wrapper for Yandex.Cleanweb

Simple captcha image generator gem

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

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.

Anti-spam protection for your website

Description of RailsCaptcha.

This is a gem wrapper for tiny captcha in C with no dependencies.

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

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