Sumada Kaabaha: comment protection
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Uber reCaptcha
This plugin adds the reCaptcha form to the WordPress login form, recover password form, register form and comment form.
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Turnstile Pro – Cloudflare CAPTCHA Protection
Lightweight, easy-to-configure Cloudflare Turnstile CAPTCHA protection for WordPress login, registration, comments, and password reset forms.
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ProofShield
Block automated abuse on WordPress login, comments, and forms with privacy-friendly, self-hosted Proof-of-Work protection.