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" .... what is the advantage of Jumpbox over VMWare or Parallels?"

Jumpbox runs on VMWare and Parallels. (And Xen and some other VM environments.)

Oh ok. I see it now. And the advantage then is that you begin with a full stack. Cool.

Yes. Plus, as someone else here pointed out, you can have a self-contained virtual "internet" to demo apps without needing an external connection.