Loganix - The most powerful spam blocker
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.
SubmitCore - SubmitCore offers web design and internet marketing services.
reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.
Referrer Spam Remover - Remove spam bots from your Google Analytics data
GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.