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SpamCop - Beware of cheap imitations! SpamCop has been protecting the internet community since 1998.
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.
Signal Spam - Tous contre l'escroquerie sur internet
MTcaptcha - Enterprise Captcha solutions
AbuseIPDB - AbuseIPDB is an IP address blacklist for webmasters and sysadmins to report IP addresses engaging in abusive behavior on their networks, or check the report history of any IP.
GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.