So VirtualBox is akin to VMWare Workstation, which is about as free as VirtualBox, both with parent companies that I wouldn't personally trust to keep the bargain, though VMWare is a lot more in flux now than VirtualBox. Broadly speaking, no business cares about desktop virtualization except *maybe* as an on-ramp to infrastructure virtualization.
FreeBSD Jails are in the neighborhood of containerization. While VMWare has tried to pretend to be relevant, they really aren't to that. That isolation is of course much more lightweight and manageable compared to trying to do something similar with virtualization. However some contexts are served better by a full fledged virtualization.
KVM is a low level implementation detail, that is important but not really the level that folks would consider competing with 'VMware'. You have libvirt based management stacks (ovirt, which should be pretty much considered abandoned), openshift (which is first and foremost a container platform, but RedHat kind of sort of trumpets the fact you can run QEMU as a container in it, a bit 'weird' for a vmware user), or openstack (not personally a fan, a bit chaotic and ultimately not a solid experience). You also have things like just using virsh from command line, virt-manager from gui, or cockpit over web to manage virtual machines, which can capably compare with using ESXi as a standalone thing.
Probably the closest in nature to 'vCenter' I've seen is ProxMox VE. Simple and to the point to deploy (unlike most of the other multi-node virtualization stacks) and sidesteps libvirt (which in the fullness of time has kind of constrained stacks built on it as qemu has grown up).