O RLY Comment Spam Search creates a quick link to make sure comments aren’t spam.
Anti-spam plugin – An advanced and free WP spam filter which protects your blog from 100 % of comment spam.
WP True Typed is an anti-spam plugin to protect your site from comment spam.
Plugin to implement Confident Technologies CAPTCHA system
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MP Spam Be Gone is the simplest, most effective Spam blocker.
Provides a configurable limit on the length of comments left in the comment form, with a dynamically updated character count displayed for the user.
All Spambots will remain away from your blog.
Stop user to submit a web address on the very first comments on any post and send those comments to spam folder.