SpamAssassin - Use this program to "Unspam" your mailbox(es).

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.

Oikik Antispam - Oikik is a cloud-based email filtering service that works with your existing email service.

reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.

Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...

DataDome - DataDome provides innovative technology and human expertise to block bad bots.