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
PHPEnkoder
Math Comment Spam Protection
Simple Trackback Validation
Http:BL WordPress Plugin
Math Captcha
Zero Spam For WordPress
Cookies For Comments
Invisible Captcha
Pierre's Wordspew
Spam Master
