etcher-bin : Flash OS images to SD cards and USB drives, safely and easily. ( https://etcher.io )
multibootusb : Create multiboot live Linux on a USB disk ( http://multibootusb.org )
rpi-imager : Raspberry Pi Imaging Utility ( https://github.com/raspberrypi/rpi-imager )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a src_prepare-overlay
For Paludis use this rsync : rsync://gentoo.zugaina.org/src_prepare-overlay-portage
If you have a problem : ycarus(-at-)zugaina.org