You'll see Windows, Office and Oracle (all of them)... open source before ESXi. Just saying.
VMware provides an "ok" free version of ESXi that will suit many...
The future however does not belong to VMware. They will start to wane as KVM/Openstack takes its place (but that could be a few years off).
If you want something VMware like today... there's always Xen/Cloudstack.... and the free (open) version of Xen doesn't have restrictions like free ESXi.
Biting the hand that feeds IT
