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Captcha PHP
Captcha PHP is a PHP class library that works without cookies....
Authen::Captcha
Authen::Captcha is a Perl extension for creating captcha's to verify the human element in transactions....
extension perl Perl extension human element element transactions
Captcha::reCAPTCHA
A Perl implementation of the reCAPTCHA API...
django-simple-captcha
A very simple, yet powerful, Django captcha application...
django-math-captcha
Simple, secure math captcha for Django forms...
kaptcha
kaptcha project is a modern version of the SimpleCaptcha project....
Captcha SimpleCaptcha clone produce captcha security code kaptcha