https://github.com/iDescriptor/iDescriptor
Currently it supports AppImage, but Flatpak version will possibly be available in future: https://github.com/iDescriptor/iDescriptor/issues/1

https://github.com/iDescriptor/iDescriptor
Currently it supports AppImage, but Flatpak version will possibly be available in future: https://github.com/iDescriptor/iDescriptor/issues/1

I didn’t see anywhere about it being able to install/restore system images, I’m assuming it can do that given what it’s based on though.