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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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Gem that uses RuCaptcha API to solver any type of captcha
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A simple image captcha gem
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MVC based Math, Logic Captcha
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Simple lib to generate a math_captcha to prevent spammers in form. Supports localization.
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Despamilator is a plugin based spam detector designed for use on your web forms borne out of two annoyances: Spam being submitted in my web forms and CAPTCHAS being intrusive. Despamilator will apply some commonly used heuristics from the world of anti-spam to help you decide whether your users are human or machine.
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A long-lived project that still receives updates
ActsAsTextcaptcha provides spam protection for Rails models with text-based logic question captchas. Questions are fetched from Rob Tuley's textcaptcha.com They can be solved easily by humans but are tough for robots to crack.
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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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