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

modernized and C99 compliant port of p0f (Passive OS fingerprinting)

A Rust library for passive traffic fingerprinting [p0f]

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.

p0f with Python.

Passive OS fingerprinting support for rspamd

Detecting Network Address Translation & Proxy Use

OS Fringerprinting