Recommendation of a free port scanning program


I am in search of a free port scanning program that will give me information on all PC's connected to a network.  The information that I really need from the scan is the operating system type installed on each scanned PC.

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rcflyrConnect With a Mentor Commented:
I second nmap:

nmap -O

will perform a port scan as well as OS detection
I like NMAP.  There is a *nix and Windows version.  The Windows version has a GUI.
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