The [base https://wiki.archlinux.org/index.php/DeveloperWiki:Core-Repository]2[busybox http://www.archlinux.org/packages/community/x86_64/busybox/] project aims to offer drop-in replacements for various central parts of the Arch linux base system.
Busybox commands are simply symlinks to the busybox binary and are thus extremely light weight. For a low footprint system, this could be quite valuable.
This [package https://aur.archlinux.org/packages.php?ID=48187] offers a nearly pain-free drop-in replacement of the GNU coreutils. Some commands lack options present in the corresponding coreutils binaries (current problems: Yaourt and readline).
Gain from replacing coreutils with busybox: [coreutils http://www.archlinux.org/packages/core/x86_64/coreutils/]: 13.1 MB installed, symlinks to busybox: approximately 0.
- Busybox-init: a very simple (only 1 runlevel) init system, ash init scripts