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

Generates and verifies ascii art captcha.

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

Wrapper for Captchabot.com

Anti-spam protection for your website

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

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

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

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.

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.

Captcha Client for YunPian.com

0-9 arası sayıları kullanarak random olarak 2 sayı seçer ve yine random olarak toplama ya da çarpma yaparak sonucu verir.

Form protection with simple captcha calculations.

Helps humankind with simpler captchas

This plugin adds helpers for the YinXiangMa CAPTCHA API

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