The Heirloom project mantains classical UNIX tools and utilities for modern open source operating systems.
The classical Bourne shell has been made available through the Heirloom project and is available as an AUR.
This package contains classical UNIX binaries corresponding to GNU coreutils, diffutils, tar and more. The binaries are organized according to the different UNIX releases, so that one can choose which generation of UNIX environment to run.
The Heirloom Toolchest is available as an AUR