p0f
A versatile passive OS fingerprinting tool
P0f is a tool that utilizes an array of sophisticated, purely passive traffic fingerprinting mechanisms to identify the players behind any incidental TCP/IP communications (often as little as a single normal SYN) without interfering in any way.
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openSUSE Tumbleweed
openSUSE Leap 16.0
openSUSE Leap 15.6
SLFO 1.2
SUSE SLE-15-SP1
SUSE SLE-12-SP5
Unsupported distributions
The following distributions are not officially supported. Use these packages at your own risk.