VirtualBox is a X86 virtualization software package originally developed by German software company innotek GmbH, now a subsidiary of Sun Microsystems. (GPL)
Linux - FreeBSD - Windows - macOS
The Xen hypervisor, the powerful open source industry standard for virtualization, offers a powerful, efficient, and secure feature set for virtualization of x86, x86_64, IA64, PowerPC, and other CPU architectures. (GPL)
Linux - FreeBSD
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