10 Free CAPTCHA Scripts and Services
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“In the past days I received several requests from my readers to suggest some CAPTCHA scripts and services quickly to embed into a web page. This post proposes a list of ten interesting scripts and services you can use to provide protection from spam bots and ensure that only humans perform certain actions.”
From Woork. This is a good canonical list. The comments include a link to a variation on CAPTCHA that I’ve seen recently, in this case, you count the number of pigs, rubber duckies, and apples when you sign in at Firepages.
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