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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.
OOPSpam Anti-Spam API - The better, new standard to stop spam content.
GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.
MTcaptcha - Enterprise Captcha solutions
StopForumSpam - StopForumSpam - a database of known forum and blog spam, its sources and the email addresses reported
AuthKong - A reliable captcha service, offers advanced security to protect websites from spam and abuse while ensuring a user-friendly experience for legitimate visitors.