[1][2][3][4] The NetBSD drivers can be used on top of the rump kernel on a wide range of POSIX operating systems, such as the Hurd,[5] Linux, NetBSD, DragonFly BSD, Solaris kernels and even Cygwin, along with the file system utilities[6] built with the rump libraries.
The rump kernels can also run without POSIX directly on top of the Xen hypervisor, an L4 microkernel using the Genode OS Framework[7] or even on OS-less bare metal.
The File System Access Utilities (fs-utils) is a subproject built with the rump libraries.
It aims to have a set of utilities to access and modify a file system image without having to mount it.
The advantage of fs-utils over similar projects such as mtools is supporting the usage of familiar filesystem Unix commands (ls, cp, mv, cd, etc.)