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.
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reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.
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AuthKong - A reliable captcha service, offers advanced security to protect websites from spam and abuse while ensuring a user-friendly experience for legitimate visitors.
Great Email Copy - A dose of emails from around the web.