WP Spam Hitman is based on set of rules and concept of hitpoint. With right set of rules and hitpoint level you can eliminate most or even all of the spam on you blog.
It works in 3 modes – Delete, Moderation, Spam and is quite customizable.
It allows to set unlimited set of rules – both – simple words and regular expression patterns. It’s simple but powerfull tool for fighting with spam.
Free Download: Download this wp-plugin