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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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Antigate (Decode captcha service) wrapper for Ruby
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AntiCaptcha api ruby wrapper
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Simple negative captcha for Rails
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Integrate the AreYouAHuman.com CAPTCHA alternative human verification into your Ruby/Rails application
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A smart captcha library
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Quick little arithmetic plain-text captcha
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Drop in feedback engine with customizable fields, and captcha available
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Generates Text Catpchas, that are 'nice' by my own personal definition!
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Simple captcha image generator gem
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Implements view helpers for the ASIRRA CAPTCHA system for Rails-based websites
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you will get arithmatic sum with answer you just have to compare with ur user in controller
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Merb plugin that provides resource access rate limits and captcha'ing
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Implementation of captcha (Completely Automated Public Turing-Test to Tell Computers and Humans Apart) that is both easy to use and easy to customize/extend.
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Description of TinyCaptcha.
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IQ, Math Captcha
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create captcha for api based project
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Forked from https://github.com/kares/simple_captcha
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jQuery slide captcha system with jQuery & jQuery UI for Rails 3
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Solve Media CAPTCHA Replacement
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