Microsoft's MSIX format is steadily becoming the standard for modern application deployment, offering a more reliable, ...
If you're testing a lot of potentially dangerous software, Windows 11 comes with an extremely useful feature called Windows Sandbox.
There are some other benefits to using an OS within a VM, like having a virtual drive that grows and shrinks based on what you need. If I need a bit more oomph, I can reconfigure my VM with more RAM ...
EVOS from EuroNAS plays in the same space as ProxMox, but isn’t free. It does, however, offer a graphical UI so customers don’t need to flex the Linux CLI skills to use it.