TypePad AntiSpam is a plugin that integrates WordPress
blogs with Six Apart's spam blocking service.
This plugin simply outputs your total Akismet spam count as plain text.
Replaces the comment form with randomised field names to prevent automated comment spam.
A plugin that can be used to block or "ban" users via their IP address from viewing your blog, and then redirecting them to a URL of your choice.
WatchMyBack24 is a powerful spamfighting plugin against comment or trackback spam.
Allows you to display a captcha on your comment form to avoid spam.
The plugin adds links to bloggers posts for readers to contact them without scripts or work-a-rounds like my email is john (at) doe.com.
WP Spam Hitman allows you to fight with spam using set of patterns and hitpoints. It also allows you to decide what's going to happen to the spam
This plugin will allow you to remove an unwanted author-URI entered by a commenter with one single click of your mouse.
Checks to see if the author name in your comments contains "HTTP:" to help filter out spam.
SecureContact is a drop in form for users to contact you. It can be implemented on a page or a post. It offers enhaced security by using captcha image
Recapture fights user registration spam by placing a reCAPTCHA on the user registration form.
This plugin adds 2 form fields to the comment form (hidden by CSS) to detect spam bots that autofill all form fields they find
Authors and commenters type their email addresses in the usual format, but eMob makes it difficult for spammers to detect and harvest them.
Prevents comment spam and fights against comment spammers by delaying their attempts
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