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This is a Captcha gem for Rails Applications. It drawing captcha image with C code so it no dependencies.
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Captcha Client for YunPian.com
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This is a Captcha gem for ruby. It drawing captcha image with C code so it no dependencies.
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A simple and custom captcha for Rails3.
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Death by Captcha Ruby implementation (HTTP API)
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RedisCaptcha provides simple captcha that can be read by human.
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Rails mountable engine, that provides captcha support
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Captcha form Jike API
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A simple image captcha gem
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MVC based Math, Logic Captcha
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RMagickCaptcha is a gem that implements captcha for using in Rails application.
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Simple, easy captcha for Sinatra
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simple stupid captcha
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adds audio support to simple captcha
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Simple reverse captcha solution that consist in create a hidden field that should be always empty.
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Simple Audio Extension to Simple Captcha
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HumanDetector is a friendly logic captcha for Rails the doesn't require any external system dependency (e.g. external captcha API connections). It uses a simple question that any 7 or more years old human can understand, but that a spambot will not be able to answer. This Gem supports Ruby v1.9.2 and Rails 3.0.x.
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SimpleCaptcha is the simplest and a robust captcha. Its implementation requires adding up a single line in views and in controllers/models. SimpleCaptcha is available to be used with Rails2.0 or above and also it provides the backward compatibility with previous versions of Rails.
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A simple CAPTCHA implementation for Rails 5+ based on RMagick.
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A simple CAPTCHA system to block bots in Rails apps.
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