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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.
mosparo - the modern spam protection
reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.
UniqPin - UniqPin is a free for non-commercial use service which destiny improve ability of interfaces detect...
Mollom - Mollom is a freemium web service to get rid of spam, unwanted content and fake users on your...
Solve Media - Solve Media's cost per engagement platform offers advertisers branded CAPTCHA and skippable Pre-Roll while providing publishers with enhanced security and a new revenue solution.