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

Helps humankind with simpler captchas

AntiCaptcha api ruby wrapper

Repackaged visualCaptcha's backend service, including translation and minor modification. Mainly for private use. Everything still belongs to original author: emotionLoop. ...

Google reCaptcha helpers and verifier

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

Integrate the AreYouAHuman.com CAPTCHA alternative human verification into your Ruby/Rails application

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

Implementation of captcha (Completely Automated Public Turing-Test to Tell Computers and Humans Apart) that is both easy to use and easy to customize/extend.

Description of TinyCaptcha.

Generates and verifies ascii art captcha.

Simple negative captcha for Rails

dongsx

IQ, Math Captcha

This is mt first gem

create captcha for api based project

Quick little arithmetic plain-text captcha

Forked from https://github.com/kares/simple_captcha

Description of RailsCaptcha.

jQuery slide captcha system with jQuery & jQuery UI for Rails 3