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

Description of TinyCaptcha.

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

This library can help you create a captcha in your terminal application, which may be damaged by a large influx of requests.

Implementation of captcha (Completely Automated Public Turing-Test to Tell Computers and Humans Apart) that is both easy to use and easy to customize/extend.

Simple negative captcha for Rails

SimpleCaptcha 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

you will get arithmatic sum with answer you just have to compare with ur user in controller

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

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...

Implements view helpers for the ASIRRA CAPTCHA system for Rails-based websites

This gem provides integration with TrustCaptcha for Ruby applications, offering CAPTCHA verification with a focus on security and privacy.

AntiCaptcha api ruby wrapper

Google reCaptcha helpers and verifier

ALTCHA is a free, open-source CAPTCHA alternative that protects your website from spam and abuse. This gem implements the ALTCHA v1 challenge protocol (challenge creation and submission verification) and integrates with Rails.cache for replay protection.

A honeypot style captcha extension for ActiveRecord. Simple one-line inclusion in the model combined with a simple form field should trap the bad guys in the molasses.

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

Generates Text Catpchas, that are 'nice' by my own personal definition!