Captcha Client for YunPian.com

A simple image captcha gem

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.

Simple lib to generate a math_captcha to prevent spammers in form. Supports localization.

Simple, easy captcha for Sinatra

Simple captcha based on plain text questions.

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

Captcha form Jike API

A simple and custom captcha for Rails3.

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

Death by Captcha Ruby implementation (HTTP API)

Rails mountable engine, that provides captcha support

generate captcha by dalli,use the memcache

MVC based Math, Logic Captcha

RMagickCaptcha is a gem that implements captcha for using in Rails application.

simple stupid captcha

adds audio support to simple 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.

Gem that uses RuCaptcha API to solver any type of captcha