HashCash – Proof Of Work CAPTCHA
Mailfix Contact Forms
Captchaapi.eu Proof-of-Work CAPTCHA
Vextor Quick Form JS
Thia Aide Comment Moderator
ActiveLayer Anti-Spam: Spam Protection F...
SpamScrubber
Inverted Checkbox Antispam
Prosopo Procaptcha
Captcha Spam Blocker
VisualWP Anti-Spam And Fraud Prevention
Doltics Validator
1on1 Secure
ContactCamo
Turbo Ecommerce
Sargas ReCAPTCHA
BelingoAntiSpam
Flair Antispam
Smart Captcha Yandex
SpamScout
SpamJam
JLA Antispam
Lemin Cropped Captcha
Disable WP Registration Page Spam
AntiSpam For Contact Form 7
Spam Protection, Anti-Spam, Comment Runn...
Math Captcha Spam Protection
SimpleForm ReCAPTCHA
