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List of installed software

tools & portable apps

locations need to be specified  manually

installed programs

If you have permissions, scan the local registry.
Pertinent entries :
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall

# powershell registry scan
cd HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
# dir
Get-Childitem -ErrorAction SilentlyContinue | Format-Table Name, SubKeyCount, ValueCount -AutoSize
# EA : ignore error on accessing security hives ( idem = - EA 4 )

(see : http://www.computerperformance.co.uk/powershell/powershell_registry.htm )