Simple Audio Extension to Simple Captcha

Block repetetive requests from logged_in users and shows captcha.

Captcha form Jike API

Generates and verifies ascii art captcha.

Easy to use classical captcha for Rails apps

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

Simple 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.

wxianfeng_simple_captcha is captcha for rails,modified from simple_captcha .

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

Display and verify arcaptcha service captcha

Captchator as Rack middleware, and helpers for sinatra.

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

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

simple stupid captcha

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

Generates Text Catpchas, that are 'nice' by my own personal definition!

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

Ruby port of VIT AutoCaptcha

SimpleCaptcha is available to be used with Rails 3 + 4 or above and also it provides the backward compatibility with previous versions of Rails.