What is a free reliable analogue of the VMware ESXi hypervisor?

Question

linux

You want to deploy a hypervisor on one of the servers. Are there any proven reliable alternatives to VMware ESXi?

The main requirement is that the hypervisor should run in a *nix environment, preferably Debian / FreeBSD. Or, so that the hypervisor itself can be deployed on a physical server, for example, like ESXi.

I ask for advice, proven by practical experience.

Answer 1

Proxmox - a pre-built Debian distro with KVM and OpenVz bundled;
knows how to cluster, and with the ability to properly prepare a fence - knows how to HA;
both Windows and *nix machines work in it, and containers in openvz linux;
can support storage (local disks, lvm, iscsi, nfs, as well as glusterfs and zfs, ceph);
when setting up network storage, it can Live Migration (without downtime);
backups, snapshots;
management - console, web interface;
free;

Answer 2

I'm sorry, but ESXi is free
https://my.vmware.com/web/vmware/evalcenter?p=free...
Costs vcenter and other products. And the hypervisor is free.

Answer 3

Hyper-V Server. Free, you can deploy on hardware.

Answer 4

KVM comes to mind

Answer 5

Xenserver look

Answer 6

I strongly recommend Citrix Xen Server. I have in the near future several infrastructures built on it, absolutely free of charge and no worse from all sides of paid VMware, otherwise it is much more transparent and convenient. And you don't need to complete paid courses to start doing something more complicated than setting up a couple of systems on a standalone server.
And if you consider that there is not a closed sawn Linux, then with knowledge and direct hands you can do almost everything there. At least put the GUI on the hypervisor :)
Hyper-V has to maintain a lot at work, to put it mildly, the system is not without jambs, and it’s completely closed, you can’t do anything extra there. Although outwardly everything looks beautiful and as if for people.