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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.
ALTCHA - ALTCHA is a free CAPTCHA alternative that uses a proof-of-work mechanism to protect your website, and online services from spam.
OOPSpam Anti-Spam API - The better, new standard to stop spam content.
MTcaptcha - Enterprise Captcha solutions
StopForumSpam - StopForumSpam - a database of known forum and blog spam, its sources and the email addresses reported