I just want a USB drive with an ISO folder- drop .iso files and if you boot off the USB, you get a menu to choose one of the ISOs. Bonus if it does UEFI and BIOS. Ideally, it doesn't require Windows ...

The Universal USB Installer (UUI) is a powerful bootable USB software tool for creating USB boot drives from ISO files, perfect for installing Linux or Windows, running live systems, or building ...