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  • 3DCaptcha - Open source system that uses spatial cognition abilities of humans to differentiate them from machines.
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  • Captcha Creator - PHP Captcha Script that generates unique captcha images to stop automated submissions, highly customizable, easy to install and configure.
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  • CAPTCHA: Telling Humans and Computers Apart Automatically - Includes demonstrations, research papers, and news.
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  • Inaccessibility of CAPTCHA - A W3C Working Group Note explaining how CAPTCHAs can present a major obstacle to users who have limited vision or a learning disability such as dyslexia. This document examines a number of potential solutions and alternative systems.
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  • JCaptcha - An open source Java framework for captcha definition and site integration. Project information, documentation, issue tracker, and download.
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  • reCAPTCHA - A captcha system that uses successful decodings to helps digitise books for online use. Background, and details on how to incorporate into a site. Source code in several languages, and plugins for popular blogging and CMS software.
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  • Securimage - Open source PHP script for generating image CAPTCHAs with audio alternatives. Includes documentation, a gallery and an online demonstration. [LGPL]
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  • TheCAPTCHA - Offers a free and open source PHP script to reduce spam, also contains a detailed article about CAPTCHAs.
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  • Wikipedia: CAPTCHA - Explains how captcha features can keep spammers from signing up for certain accounts online, such as email or weblogs. Explains how the system can be circumvented as well.
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Last update: March 1, 2015 at 8:24:09 UTC - edit