Below is a list of operating systems and software applications I have used extensivley, I have solid understanding of any application listed, and how to use\deploy in a very large corporate setting.
(There are many applications I have not listed that I am familiar with)
DISCLAIMER Most of my work
has been done within the Microsoft Windows world, so my OS skills are extensive there, but also includes the others.
Windows, MAC OS, various UNIX flavors
Electronic Forensics Applications
Encase, FTK, RoboCopy, VOOM
Intursion Detection Applications
Arcsight, Cisco IPS, Cisco Works, McAfee EPO, Lancope's Stealwatch
MS SQL, MS Access (yes its actually still used)
VMWare, Various Sandboxes, Sysinternals Utilities, Foundstone Tools, etc
Various Usefull Applications
PGP, SecureID, VPN, SSH, SFTP, Putty, etc