No two environments are the same. Instead of looking for a like for like total replacement (even though you actually don't use all VMware features or use some only because they were the only way possible in VMware's ecosystem and not because they're actually any good (vRA, Log Insight)), evaluate your actual needs and what do you need to run under what conditions. You'll probably end up discovering that any of Proxmox, OpenStack Nutanux, oVirt, Ganetti, Kubernetes (with or without KubeVirt), Nomad (with or without VMs) will cover most if not all that you need.