Display and verify arcaptcha service captcha

Antispam helps prevent spam in your Rails applications by checking against DNS blacklists and spam-prevention databases. It has two core features: (1) IP-based spam detection using Project Honey Pot to block known spammers automatically, and (2) content-based spam detection using Defendium’s mach...

Description of TinyCaptcha.

Merb plugin that provides resource access rate limits and captcha'ing

Simple negative captcha for Rails

This gem enable to use Captchme. Anti spam, Monetize captcha and Audience qualification

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

IQ, Math Captcha

Forked from https://github.com/kares/simple_captcha

Description of RailsCaptcha.

jQuery slide captcha system with jQuery & jQuery UI for Rails 3

Simple captcha image generator gem

Solve Media CAPTCHA Replacement

Form protection with simple captcha calculations.

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

Merb plugin that provides resource access rate limits and captcha'ing

This gem enable to use Captchme. Anti spam, Monetize captcha and Audience qualification

Block repetetive requests from logged_in users and shows captcha.

Ruby wrapper for Yandex.Cleanweb

Integrate the AreYouAHuman.com CAPTCHA alternative human verification into your Ruby/Rails application