A simple and custom captcha for Rails3.

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

Submit captcha images and retrieve the text as a string.

Captcha Gem for Rails, which generates captcha image by Rust.

Rails mountable engine, that provides captcha support

Captcha form Jike API

Simple negative captcha for Rails

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

simple stupid captcha

adds audio support to simple captcha

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

Block repetetive requests from logged_in users and shows captcha.

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

A gem to generate captcha pictures.

To help with keep the bots at bay this gem helps you easily add honeypots to forms and/or obfuscate your form field names

Metabypass | Ruby-based easy implementation for solving any type of captcha by Metabypass

Captcha-Plugin for Rails

anti-captcha is a Ruby library for recognize captcha on anti-captcha.com

Captchator as Rack middleware, and helpers for sinatra.

Simple negative captcha for Rails