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TryCaptcha - A Collection of Open Source CAPTCHA Packages
The purpose of TryCaptcha is to help you choose a CAPTCHA for your PHP site.
We have collected a bunch of freely available PHP CAPTCHA packages and installed them, so you can try them out and see how they behave.
Note: a CAPTCHA is a tool that allows a web site to tell people apart from automated computer programs. To "pass" the CAPTCHA, you must solve a puzzle. A good CAPTCHA displays a puzzle that can be easily solved by humans, but is very difficult for computers.