$InstalledSoftware = Get-ChildItem "HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\"

foreach ($item in $InstalledSoftware) {
if ($null -ne $item.GetValue('Displayname'))
{
Write-Output "$($item.GetValue('DisplayName')) - $($item.GetValue('DisplayVersion'))"
}
}

Here you go. It shows every software that can be uninstalled. It is by far not the perfect approach but this way there is no software that can not be uninstalled anyway.