This plugin protects your WPMU signup process against spambots with a simple math question.
Plugin Tag: spam
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Email to Image
Avoid to get the email addresses in your blog to be indexed by spambots in a fancy and very efective way.
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TMD Spam Killer
Hides the 'Comment Website URL' field, kills WP if a spam 'bot submits a comment which includes a Comment Author URL.
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VouchSafe CAPTCHA Replacement
VouchSafe is an easy, effective replacement for comment and registration CAPTCHAs that's highly secure, and easier for your users to complete.
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Yappa Widget
Yappa is the web's most popular comment system. Use Yappa to increase engagement, retain readers, and grow your audience.
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WP-Spam-Hitman
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
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Analytical Spam Filter
Block WordPress comment spam, trackback spam, and pingback spam through intelligent analytics instead of interactive challenge response tests.

