Simple negative captcha for Rails

anti-captcha is a Ruby library for recognize captcha on anti-captcha.com

BrainBuster - a logic captcha for Rails

A Google-style captcha for enterprise Rails apps

A Google-style captcha for enterprise Rails apps

This plugin adds helpers for the YinXiangMa CAPTCHA API

This gem enable to use Captchme. Anti spam, Monetize captcha and Audience qualification

Solve Media CAPTCHA Replacement

This is a gem wrapper for tiny captcha in C with no dependencies.

Death by Captcha Ruby implementation (HTTP API)

Simple, easy captcha for Sinatra

这是一个验证码生成器。基于rucaptcha。本人只是将他的源码拉下来。为我的网站进行适配。因为我不使用sesion.id

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

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

NO LONGER MAINTAINED AND NOT RECOMMENDED, AS BOTS ARE ABLE TO RESOLVE CAPTCHAS BETTER THAN HUMANS. Based on Login Attempts check if captcha is necessary. It stores a permanent cookie and uses a table for tracking login requests.

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

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

Quick little arithmetic plain-text captcha

This is mt first gem

IQ, Math Captcha