Correction:
"(...) run those in separate Virtualboxes."
- should read:
"(...) run those in separate #virtualMachine (s) ."
E.g. #QubesOS , is a more secure (and #complex (...)) alternative to #Virtualbox , #VMware , etc., also offering to run various #operatingSystems as independent, separate virtual machines.
And then there is #Docker #containers ...