Well the first question is, do you actually need hypervisors? In a lot of cases, the answer is no, or not for many of the workloads. In others it's 100% yes.

Then, after you've decided you actually do need a hypervisor, there's actually tons of choice - Proxmox (very good and advanced KVM wrapper), Nutanix's AHV, oVirt (future kind of up in the air), OpenStack, KubeVirt, XCP-ng.

Problem is, many VMware users are set in their ways and want an exact and 1:1 replacement, without even considering they were only doings things that way because that was the only tool they knew and had at their disposal, not because it's actually a good way of doing things. Virtual Machines are just a means to an end, and a clunky one at that. VMware are actively pushing you away, time to start paying attention and considering what the organisation's actual needs are, and how are they best served. (And unless you're doing VDI, or almost exclusively using third party appliances delivered as VM images, that's not virtual machines).