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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
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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/
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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/
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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/
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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/
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