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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.
scr.im - Don't share your email on public sites.
UniqPin - UniqPin is a free for non-commercial use service which destiny improve ability of interfaces detect...
Humans Not Invited - CAPTCHA that filters out humans and only lets programs pass
visualCaptcha - The best captcha alternative. Accessible, Mobile-friendly, and Retina-ready! Available for Node.js, PHP, Ruby, Meteor, jQuery, Angular, and vanilla JS.