No download available? I thought it'd be fun to mess around with but maybe it's for paying customers only.
https://vmssoftware.com/community/community-license/
I guess I shouldn't be surprised that this is a VM-only product, but there's something unsatisfying about an O/S that can't boot real hardware.
I kind of hope more (new) OSes adopt a similar model. Developing cool new experimental OSes would be easier if real hardware could be "ignored" in favor of just targeting virtio interfaces or something, and IMO that's where the most interesting OS dev is yet to happen. If you're mostly interested in hardware support and raw performance, I think Linux has "done it". But there's a lot left to explore, and maybe it's best to find a way to get Linux to do the heavy lifting.
There's alot of room for adjustments/experimentation within the posix-like OS space; Linux is not always the best vehicle for this experimentation (witness various threading/ipc/scheduling differences with others, security protections, etc. that a) exist and/or b) have been imported/emulated in Linux )
There are still new/tweaked ways to manage/divide raw hardware, though. Stuff like trying to reduce UI latency which would be hard to do through a PV interface and needs bare metal.
According to their roadmap [0] they are aiming to release support for running on HPE DL380 servers bare metal this year, followed by support for some 2 socket Dell servers next year.
Based on some claims I have seen elsewhere, they plan to release the V9.1 to non-commercial customers, which is meant to happen some time before the end of H1 of this year.