Anti-spam comment system.
https://wordpress.org/plugins/wp-spamfree/
Widgets · WordPress Plugins
Get access to data on 41,175 websites that are WP-SpamFree Anti-Spam Customers. We know of 9,638 live websites using WP-SpamFree Anti-Spam and an additional 31,537 sites that used WP-SpamFree Anti-Spam historically and 5,757 websites in the United States.
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Get a list of 41,175 websites using WP-SpamFree Anti-Spam which includes location information, hosting data, contact details, 9,638 currently live websites and an additional 1,676 domains that redirect to sites in this list. 31,537 sites that used this technology previously and 5,757 websites in the United States currently using WP-SpamFree Anti-Spam.