Akismet is a spam fighting service that protects millions of WordPress sites from comment and contact form spam.
Software reviewed and mentioned in the article
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Say Goodbye to comment spam on your WordPress blog or website.
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GAS
Growmap Anti Spambot Plugin
This hasn't been added to SaaSHub yet
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WPS
WP SpamShield Anti-Spam
This hasn't been added to SaaSHub yet
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WPZ
WordPress Zero Spam
This hasn't been added to SaaSHub yet