Comment spam prevention without moderation, captchas or questions
WangGuard - MailPoet Connector is a plugin for connect WangGuard plugin with MailPoet.
Add Hashcash spam protection to Contact Form 7.
Comment Spam Prevention without CAPTCHA. No CAPTCHA, No SPAM!
minteye - STOP SPAM, MAKE MONEY!
This plugin is a simple captcha that appears when an unregistered user try to register or to leave a comment.
minotaur - Rid the internet of text CAPTCHAs!