System Admin Tools

I am trying to compile a list of tools used by adminstrators for security and system tools. I am looking for some help.
Please add to the list and list urls for more thank you.

PortSentry
Tripwire
Chkrootkit
Nmap
Snort

http://www.insecure.org/tools.html --- Good start...does anyone have any others they like or use?

 

 

 

 

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