This is a Captcha gem for Rails Applications. It drawing captcha image with C code so it no dependencies.

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

Unity Captcha is a gem that use two levels of Captcha. First level is about Left Hemisphere: Logic and Math. Second level is about Right Hemisphere: Intuition and Drawing. This two levels functioning in complete harmony creates unity and this is the base design of this Captcha.

TwoCaptcha allows you to solve captchas with manual labor

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

DeathByCaptcha allows you to solve captchas with manual labor

Google reCaptcha helpers and verifier

Drop in feedback engine with customizable fields, and captcha available

Ruby port of VIT AutoCaptcha

AntiCaptcha api ruby wrapper

0-9 arası sayıları kullanarak random olarak 2 sayı seçer ve yine random olarak toplama ya da çarpma yaparak sonucu verir.

adds audio support to simple captcha

Simple Audio Extension to Simple Captcha

ZeroCaptcha allows companies to solve captchas with artificial intelligence software, which is faster than humans and very accurate

Block repetetive requests from logged_in users and shows captcha.

Captcha library which uses imagemagick to create captchas

Simple captcha

RubyGem package for visualCaptcha's backend service

A captcha solver (only for easy ones) gem

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