Greetings,
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I found only two possible free/open source alternatives for OpenVZ 6:
- LXC
- systemd-nspawn
Some you seem to have overlooked?!?
1) OpenVZ 7 2) LXD from Canonical that is part of Ubuntu 3) podman containers with systemd installed (set /sbin/init as the entry point)
I use LXC on Proxmox VE (which I guess should be #4 above) some although I primarily use it for VMs.
Oh, LXD is supposedly packaged for other distros but given that they aren't much into SELinux and they are into snaps, I'd not really recommend it outside of Ubuntu.
TYL,