Mollom is shutting down, what are the alternatives?

Mollom has reached its End of Life. 2bits blogs about an alternative, antibot.

The recommended alternative by Acquia is a combination of reCAPTCHA and Honeypot.

But there is a problem with this combinationa: reCAPTCHA, like all modules that depend on the CAPTCHA module, disable the page cache for any form that has CAPTCHA enabled.

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Another alternative that we have been using that does not disable the page cache is antibot module.