Sir-Uli

This plugin provides a possibility to block comments based on words of a predefined list. The built-in lists of wordpress only allow to send comments to the moderation- or to the spam-queue but not to block them completely. This is remedied with this plugin, which allows to block comments based on a definable list.
Attention #1: Use wordlist with care, there is no logging of the blocked comments!
Attention #2: It will also match inside words, so “press” will match “WordPress” as well!

WU – Block comments

This plugin provides a possibility to block comments based on words of a predefined list.

Andy Stratton

bmoredrew

WP Maintainer

Sizeable Labs

Referer spam has been growing and clogging up website analytics data (such as Google Analytics) with fraudulent traffic statistics. Millions of users are reporting issues and it has become a major nuisance.
Block these malicious sites easily. All major referer spam domains blocked out of the box and you can customize the domain keyword lists to block any domains you wish. Brought to you by the team of WordPress experts at WP Maintainer.

Referer Spam Blocker

Block/blacklist known (and custom) spam referring domains at the WordPress level with an HTTP 403 Forbidden page.

WU – Block comments vs Referer Spam Blocker