Sumada Kaabaha: antibot
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Spam Master
Spam protection, firewall, anti-spam protection from millions of known spam ips, emails, domains and words.
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Good Question
Simple plugin to stop spam comments and registrations on your site. Adds a question field on the form, easy for humans, but not solvable for the bots.
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wk-email-antibot
Simply enables WordPress shortcode for easily letting you camouflage an email address, hiding it from crawling spiders and bots.