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

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

AntiCaptcha api ruby wrapper

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

Captcha generator for rails

Google reCaptcha helpers and verifier

Solve Media CAPTCHA Replacement

Define questions and answers in a YAML file and validate your models with a single line of code. No more captchas or other stupid tricks.

Helps humankind with simpler captchas

Form protection with simple captcha calculations.

Anti-spam protection for your website

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

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.

Quick little arithmetic plain-text captcha

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