Half of these exist because I was bored once.
The Windows 10 and MacOS ones are GPU passthrough enabled and what I occasionally use if I have to use a Windows or Mac application. Windows 7 is also GPU enabled, but is more a nostalgia thing than anything.
I think my PopOS VM was originally installed for fun, but I used it along with my Arch Linux, Debian 12 and Testing (I run Testing on host, but I wanted a fresh environment and was too lazy to spin up a Docker or chroot), Ubuntu 23.10 and Fedora to test various software builds and bugs, as I don't like touching normal Ubuntu unless I must.
The Windows Server 2022 one is one I recently spun up to mess with Windows Docker Containers (I have to port an app to Windows, and was looking at that for CI). That all become moot when I found out Github's CI doesn't support Windows Docker containers despite supporting Windows runners (The organization I'm doing it for uses Github, so I have to use it).
That’s a beast of a Mac. Wake on lan is your friend. I have the same problem with my Threadripper. I wrote a script that issues a WOL command to either start/unsuspend my Ubuntu machine so I can turn it off when not in use. It’s probably $70/month difference for me. Most of my virtualization is on Linux but I’ve moved away from VM Ware because QEMU/KVM has worked so well for me. You should check out UTM on the Mac App Store and see if that solves any of your problems.
Man this thread has taught me all sorts of things. I will definitely check out UTM. Thanks for that!!