Quickemu is a command line wrapper for QEMU that can be used to quickly create and run highly optimized Linux, macOS, *BSD and Windows desktop virtual machines. It's currently only intended for use on Linux hosts (it also works on WSL), but in the future it might also support macOS hosts.

Instead of expecting an exhaustive list of configuration options, Quickemu tries to automatically "do the right thing" and creates the VM configuration automatically for you. Besides this, the tool also automatically downloads the Linux, macOS or Windows image, so all you have to do is run and install the OS in the virtual machine.

Even though using Quickemu you don't need to configure anything, e.g. it automatically calculates the number of CPU cores and RAM it should allocate to a VM based on the host computer specifications, you can still use custom config options in the .conf file.

What's more, if using the command line is not your thing, there's also a third-party GUI for Quickemu written in Flutter, called Quickgui:

Ventoy, a tool to create bootable USB drives by simply copying the ISO to the USB (with support for as many ISOs as you want, even mixed Linux and Windows ISO files), has been updated with a new webUI plugin configurator which makes it easy to configure the powerful Ventoy plugins.

You install this tool to a USB drive, then simply copy some ISO files to the USB drive, and you can boot from it with no other changes (so without having to reformat the USB drive every time you want to create a bootable USB drive, and without having to extract the ISO file contents). You can also continue using the USB stick for other things, and it will continue to work as a bootable USB. The application is available for Microsoft Windows and Linux.