Add Hashcash spam protection to Contact Form 7.

(3)

Zero Spam makes blocking spam comments and registrations easy.

(3)

Easy-to-use tool to get rid of spam attacking your website AntiSpamLight is developed to help you to forget about annoying spam bots! No more spam and …

(3)

Performs a simple but very effective test on all incoming trackbacks in order to stop trackback spam.

(3)

Upon activation, SpamLord eliminates the potential for automated spam comments, as well as trackback spam.

(3)

WordPress plugin to fight with 500+ referrer spammers (like semalt, buttons-for-website and many more).

(3)

Comment spam prevention without moderation, captchas or questions

(3)

Plugin to reject spam. Port from same author from http://www.phpbbantispam.com Actually visits the URL from commenter to spider for spamwords.

(2)