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reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.
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.
DOOM Captcha - Captchas don't have to be boring
Humans Not Invited - CAPTCHA that filters out humans and only lets programs pass
GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.
DataDome - DataDome provides innovative technology and human expertise to block bad bots.