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p0f v3 with impersonation spoofing, written in Python - Accurately guess the OS of a packet with passive fingerprinting.
Network Tools
Purely passive OS and application fingerprinting system
Floodspark Counterespionage Firewall (CEF) helps you record and block or honeypot reconnaissance or otherwise illegitimate traffic. CEF is like a web application firewall (WAF) but protects against reconnaissance.
TCP Fingerprinting of email senders.
Detecting Network Address Translation & Proxy Use
Passive OS fingerprinting support for rspamd