VirtualBox"VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as home use. [It is] ... the only professional solution that is freely available as Open Source Software under the terms of the GNU General Public License (GPL) version 2. ...Presently, VirtualBox runs on Windows, Linux, Macintosh, and Solaris hosts and supports a large number of guest operating systems including but not limited to Windows (NT 4.0, 2000, XP, Server 2003, Vista, Windows 7, Windows 8, Windows 10), DOS/Windows 3.x, Linux (2.4, 2.6, 3.x and 4.x), Solaris and OpenSolaris, OS/2, and OpenBSD." (as of Aug. 31, 2022) Recent versions of Windows may offer comparable virtualization options.