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StopForumSpam - StopForumSpam - a database of known forum and blog spam, its sources and the email addresses reported
hCaptcha - Do you use a captcha to keep out bots? hCaptcha is a drop-in replacement for reCAPTCHA that earns website owners money and helps companies get their data labeled.
GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.
Mollom - Mollom is a freemium web service to get rid of spam, unwanted content and fake users on your...
MTcaptcha - Enterprise Captcha solutions
Akismet - Akismet is a spam fighting service that protects millions of WordPress sites from comment and contact form spam.