Anti-spam comment system.
https://wordpress.org/plugins/wp-spamfree/
Widgets · WordPress Plugins
Get access to data on 46,691 websites that are WP-SpamFree Anti-Spam Customers. We know of 13,689 live websites using WP-SpamFree Anti-Spam and an additional 33,002 sites that used WP-SpamFree Anti-Spam historically and 8,298 websites in the United States.
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Get a list of 46,691 websites using WP-SpamFree Anti-Spam which includes location information, hosting data, contact details, 13,689 currently live websites and an additional 2,640 domains that redirect to sites in this list. 33,002 sites that used this technology previously and 8,298 websites in the United States currently using WP-SpamFree Anti-Spam.