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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.
Akismet - Akismet is a spam fighting service that protects millions of WordPress sites from comment and contact form spam.
MTcaptcha - Enterprise Captcha solutions
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GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.