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reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.
scr.im - Don't share your email on public sites.
Humans Not Invited - CAPTCHA that filters out humans and only lets programs pass
Spamty - Spamty is a web service to encrypt an email address and share it on the internet.
DOOM Captcha - Captchas don't have to be boring
Squat Captcha - The worst captcha ever! Forces you to do 10 squats