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Links 1 through 6 of 6 by Libin Pan tagged captcha

Securimage is an open-source free PHP CAPTCHA script for generating complex images and CAPTCHA codes to protect forms from spam and abuse. It can be easily added into existing forms on your website to provide protection from spam bots.

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BrainBuster is a logic captcha for Rails. A logic captcha attempts to detect automated responses (i.e., spambots) by asking a simple question such as a word puzzle or math question.

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