xprobe2(1) on Linux
The text 153525f85b7b, as Debian 3.1 (Sarge) shipped it.
A Remote active operating system fingerprinting tool.
Flags it lists
-
-A -
-B -
-D -
-F -
-T -
-U -
-X -
-c -
-m -
-o -
-p -
-r -
-t -
-v