Savetheinternet wrote: [snip] Securimage (phpcaptcha.org) looks relatively okay.[snip]
..a final follow up with my experience implementing securimage (in the case that others go searching).
This turned out to be a good solution for my purposes. It fit nicely with my form checks that were already in place (the quick start guide leaves room for various schools of thought regarding input cleaning).
My suggestion: be sure to first run their compatibility check script before spending time downloading the files / reading the quick start.
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