Ruby port of VIT AutoCaptcha

Ruby wrapper for Yandex.Cleanweb

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

A simple and fast image captcha generator that uses opencv and memcached.

Simple captcha

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.

wxianfeng_simple_captcha is captcha for rails,modified from simple_captcha .

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.

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

Google reCaptcha helpers and verifier

Anti-spam protection for your website

A simple and custom captcha for Rails3.

anti-captcha is a Ruby library for recognize captcha on anti-captcha.com

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

Submit captcha images and retrieve the text as a string.

Captchator as Rack middleware, and helpers for sinatra.

Rails mountable engine, that provides captcha support

Simple negative captcha for Rails

Generates and verifies ascii art captcha.

Simple negative captcha for Rails