I need a network security app to test for open Ports.

I have been using Gibson's Research site to test for open internet port on Win7 desktop.   How do you rate this program and are there other apps you would recommend to test port security on  a win7 and Macbook Pro desktop?
Howie KaySystems Engineer Lockheed-RetiredAsked:
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Bryant SchaperCommented:
nmap does exactly that, runs on linux, osx and windows.  But you have to do the pen test from another machine, windows cannot test itself

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Bryant SchaperCommented:
also it is free too
I vote for nmap.

As  Bryant Schaper   stated, windows can't scan itself, but you can use the following command to see what it has open:

netstat -an | findstr /c:"LIST"
On OS X, there is also Network Utility, which has a Port Scanner function.
Kamran ArshadIT AssociateCommented:

NMAP is a nice utility. Other options include;

Angry IP Scanner
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