CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is provided by the VisualConfirmPlugin.
See details on the CaptchaPlugin at http://twiki.org/cgi-bin/view/Plugins/CaptchaPlugin
As of 2006-02-17, ErfurtWiki, MediaWiki, Oddmuse, PhpWiki, TWiki and WackoWiki are reported to have CAPTCHA capabilities. Compare them.
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