Captcha generator for rails

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

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

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

Simple reverse captcha solution that consist in create a hidden field that should be always empty.

Block repetetive requests from logged_in users and shows captcha.

Unity Captcha is a gem that use two levels of Captcha. First level is about Left Hemisphere: Logic and Math. Second level is about Right Hemisphere: Intuition and Drawing. This two levels functioning in complete harmony creates unity and this is the base design of this Captcha.

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

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.

Due to many unrequited complaints to the recaptcha team with regard to its unreadability for real human users, this gem offers a more readable selection of captcha images.

Captcha Client for YunPian.com

Anti-spam protection for your website

Captcha form Jike API

adds audio support to simple captcha

A simple and custom captcha for Rails3.

Captchator as Rack middleware, and helpers for sinatra.

It's a Rails Captcha Engine for Rails 3 applications.

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

simple stupid captcha