User Spam Remover
Minteye
Comment E-Mail Verification
Quiz
IP Filter
多说社会化评论框
Bye Maridjan
AVH First Defense Against Spam
Mailgun Email Validator
WP-NOTCAPTCHA
Simple Trackback Validation With Topsy B...
Obfuscate Email
Move Comments
WP-Hashcash
Drainware Comments Filter
Greg's Comment Length Limiter
Stop Spam Comments
WPCommentCleaner
Anti-Captcha (anti-spam Botblocker)
Spam Destroyer
Bulk Comment Remove
WP Anti Spam
Solve Media CAPTCHA
Spammer Blocker
IntenseDebate Comments
WyPiekacz
WPBruiser {no- Captcha Anti-Spam}
Block Spam By Math Reloaded
