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 a...

reCAPTCHA was too much for us, so we created this. Simplest captcha ever.

SimpleCaptcha is available to be used with Rails 3 + 4 or above and also it provides the backward compatibility with previous versions of Rails.

Unobtrusive, flexible and complete spam protection for Rails applications using honeypot strategy for better user experience.

Captcha-Plugin for Rails

Description of TinyCaptcha.

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

DeathByCaptcha allows you to solve captchas with manual labor

Rack middleware Captcha verification using Recaptcha API.

RubyGem package for visualCaptcha's backend service

Generates and verifies ascii art captcha.

A Google-style captcha for enterprise Rails apps

dongsx

Wrapper for Captchabot.com

API to interact with BrandCAPTCHA http://www.pontamedia.com/en/brandcaptcha/

Arithmetic Captcha

AntiCaptcha api ruby wrapper

Simple negative captcha for Rails

Gem that uses RuCaptcha API to solver any type of captcha

这是一个验证码生成器。基于rucaptcha。本人只是将他的源码拉下来。为我的网站进行适配。因为我不使用sesion.id