Author here.<p>There is still a tiny VM running. This one happens to be the Native OS X Hypervisor Framework. From the docs:<p>&gt; Hypervisor (Hypervisor.framework). The Hypervisor framework allows virtualization vendors to build virtualization solutions on top of OS X without needing to deploy third-party kernel extensions (KEXTs). Included is a lightweight hypervisor that enables virtualization of the host CPUs.<p><a href="https:&#x2F;&#x2F;developer.apple.com&#x2F;library&#x2F;mac&#x2F;releasenotes&#x2F;MacOSX&#x2F;WhatsNewInOSX&#x2F;Articles&#x2F;MacOSX10_10.html" rel="nofollow">https:&#x2F;&#x2F;developer.apple.com&#x2F;library&#x2F;mac&#x2F;releasenotes&#x2F;MacOSX&#x2F;...</a><p>I&#x27;ve had a great run with VirtualBox, between Vagrant and Docker Machine. But I can&#x27;t lie, I won&#x27;t miss its installer, uninstaller, OS X kernel extensions, questionable network file sharing, and more. Removing a big blob of software between me and my virtualization-ready CPU is progress.<p>Then Docker for Mac is the one-two punch. Simpler virtualization, extremely rich containerization.