Are there open source CAPTCHA solutions available?

Posted by craigmoliver on Stack Overflow See other posts from Stack Overflow or by craigmoliver
Published on 2008-10-28T17:50:44Z Indexed on 2010/03/15 8:49 UTC
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Filed under:

captcha

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subjective

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form-validation

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language-agnostic

I'm in the process of adding CAPTCHA validation to one of my websites and need to know what open source solutions exist. Please note strengths and weaknesses and what platform they work with. I'm primarily interested in ASP.NET solutions but feel free to include PHP, Java, etc.

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