Captcha form Jike API

Simple negative captcha for Rails

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

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

Anti-spam protection for your website

This is mt first gem

Description of RailsCaptcha.

Submit captcha images and retrieve the text as a string.

This plugin adds helpers for the YinXiangMa CAPTCHA API

ZeroCaptcha allows companies to solve captchas with artificial intelligence software, which is faster than humans and very accurate

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

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

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

A very simple rack captcha middleware via captchator.com API

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

Ruby port of VIT AutoCaptcha

Wrapper for Captchabot.com

Unity Captcha is a gem that use two levels of Captcha. First level is about Left Hemisphere: Logic and Math. Second level is about Right Hemisphere: Intuition and Drawing. This two levels functioning in complete harmony creates unity and this is the base design of this Captcha.

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

RedisCaptcha provides simple captcha that can be read by human.