Among the new virtualization capabilities debuting in FreeBSD 10 is the new BSD Hypervisor called “byhyve,” which is an alternative to the open-source Xen and KVM hypervisors that are popular with Linux users.
“bhyve is an experimental hypervisor that runs guest operating systems inside a virtual machine, the FreeBSD project page for byhve explains. “Parameters such as the number of virtual CPUs, amount of guest memory and I/O connectivity can be specified with command-line parameters.”