Google reCaptcha helpers and verifier

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

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

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

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

A smart captcha library

Antigate (Decode captcha service) wrapper for Ruby

Generates and verifies ascii art captcha.

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

dongsx

IQ, Math Captcha

A simple and fast image captcha generator that uses opencv and memcached.

This is mt first gem

create captcha for api based project

Quick little arithmetic plain-text captcha

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

Anti-spam protection for your website

A captcha that uses images instead of garbled text

This plugin adds helpers for the YinXiangMa CAPTCHA API

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.