Easy to use classical captcha for Rails apps

A gem to generate captcha pictures.

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 Client for YunPian.com

0-9 arası sayıları kullanarak random olarak 2 sayı seçer ve yine random olarak toplama ya da çarpma yaparak sonucu verir.

A simple and custom captcha for Rails3.

Google reCaptcha helpers and verifier

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

you will get arithmatic sum with answer you just have to compare with ur user in controller

Captcha based on encyrpting and decrypting user data by mathematical operation

Submit captcha images and retrieve the text as a string.

Captchator as Rack middleware, and helpers for sinatra.

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

Death by Captcha Ruby implementation (HTTP API)

Simple negative captcha for Rails

Description of TinyCaptcha.

A smart captcha library

Captcha form Jike API

Antigate (Decode captcha service) wrapper for Ruby

Simple negative captcha for Rails