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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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ReCAPTCHA is the same one StackOverflow uses. It has an ASP.NET implementation.
It uses a webservice to provide the captcha images; this is an university trying to digitize difficult to OCR texts. I'm not sure how easy it would be to replace this portion. There are many open source client implementations, as the API is quite well documented.
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Jeff Atwood has a captcha control + source hosted on his coding horror site
ReCaptcha might be another alternative but i don't think the source is open.
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