textTHaCAA: A system for Telling Humans and Computers Apart Automatically that was inspired by CAPTCHA from Carnegie Mellon

textTHaCAA is a system for Telling Humans and Computers Apart Automatically that was inspired by CAPTCHA from Carnegie Mellon. Unlike image-based problems which can be difficult for people with certain disabilities, it is designed to be accessible to all users. It achieves this by asking simple randomly generated text-based multiple choice questions where the user has to select the members of one group from a list randomly selected from members of a series of different groups.

[Environment]		Web Environment
[Intended Audience]		Advanced End Users, Developers, System Administrators
[License]		OSI Approved :: GNU Lesser General Public License (LGPL)
[Programming Language]		PHP
[Topic]		Internet :: WWW/HTTP, Internet :: WWW/HTTP :: Dynamic Content :: CGI Tools/Libraries, Internet :: WWW/HTTP :: Dynamic Content :: Message Boards, Internet :: WWW/HTTP :: Dynamic Content :: Wiki, Internet :: WWW/HTTP :: Site Management