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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.
http://www.captchacreator.com/ - New window - Cached - Archive - |
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| | CAPTCHA: Telling Humans and Computers Apart Automatically |
| | Includes demonstrations, research papers, and news.
http://www.captcha.net/ - New window - Cached - Archive - |
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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.
http://www.w3.org/TR/turingtest/ - New window - Cached - Archive - |
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| | JCaptcha |
| | An open source Java framework for captcha definition and site integration. Project information, documentation, issue tracker, and download.
http://jcaptcha.sourceforge.net/ - New window - Cached - Archive - |
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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.
http://recaptcha.net/ - New window - Cached - Archive - |
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| | RNIB Web Access Centre Blog: CAPTCHA - If Your Name's Not Down You're Not Coming In |
| | Article outlining the accessibility issues with CAPTCHAs, and describing some possible solutions, none of which are found by the authors to be completely satisfactory.
http://www.rnib.org.uk/wacblog/images/captcha-if-youre-names-not-down-youre-not-coming-in/ - New window - Cached - Archive - |
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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]
http://www.phpcaptcha.org/ - New window - Cached - Archive - |
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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.
http://en.wikipedia.org/wiki/CAPTCHA - New window - Cached - Archive - |
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