VirtualBox is a free Open Source: “where information was found”. This could be anything from an archive in a county records office, a book, or even a relative’s recorded recollection. Citing your Sources helps to show how you reached a particular conclusion about an Individual. Software virtualization product that runs under Windows, Mac, Linux or Solaris, and lets you run multiple operating systems (inside multiple virtual machines) at the same time. So, for example, you can run Windows and Linux on your Mac. See https://www.virtualbox.org/ for details.
See Running Family Historian on a Virtual Machine for additional advice.Link: Oracle VirtualBox