Rails mountable engine, that provides captcha support

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

wxianfeng_simple_captcha is captcha for rails,modified from simple_captcha .

A simple and custom captcha for Rails3.

Rack middleware Captcha verification using Recaptcha API.

Despamilator is a plugin based spam detector designed for use on your web forms borne out of two annoyances: Spam being submitted in my web forms and CAPTCHAS being intrusive. Despamilator will apply some commonly used heuristics from the world of anti-spam to help you decide whether your users are human or machine.

Captchator as Rack middleware, and helpers for sinatra.

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.

simple stupid captcha

Submit captcha images and retrieve the text as a string.

SimpleCaptcha is the simplest and a robust captcha. Its implementation requires adding up a single line in views and in controllers/models. SimpleCaptcha is available to be used with Rails2.0 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!

Captcha generator for rails

Arithmetic Captcha

ReCaptcha implements view helpers to generate ReCaptcha code, with the noscript counterpart, required methods that interface with the HTTP API for captcha verification, a DSL to generate a before_filter and the code to implement AJAX captcha validation.

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.

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

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

A captcha verification approach for Rails apps, directly integrated into ActiveRecord’s validation mechanism and providing helpers for ActionController and ActionView.

Simple negative captcha for Rails