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

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

Wrapper for Captchabot.com

A simple image captcha gem

IQ, Math Captcha

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

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

Solve Media CAPTCHA Replacement

Simple captcha based on plain text questions.

Captcha generator for rails

Simple gem to add captcha or negative captcha to your Rails 3 application

simple stupid captcha

adds audio support to simple captcha

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.

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

A very simple rack captcha middleware via captchator.com API