Plugin Tag፥ antibot
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Spam Master
Real-time firewall and anti-spam for WordPress. Block spam bots, comments, logins & registrations. No CAPTCHA, no slowdown.
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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.