Ventoy

Ventoy is an open-source tool for creating bootable USB drives that can hold multiple ISO/WIM/IMG files at once — Windows installers, Linux distros, Proxmox VE, rescue disks, and more — without reformatting or re-flashing the drive for each one.

Instead of writing a single image directly to the USB the way tools like Rufus do, Ventoy installs its own boot menu to the drive once. After that, you just copy ISO files onto the USB like any other storage device, and Ventoy detects and boots each one from a menu at startup. This makes it especially useful for building a "Swiss Army knife" USB drive covering several operating systems and install scenarios.