The [Heirloom project](http://heirloom.sourceforge.net/) maintains classical UNIX tools and utilities for modern open source operating systems.

Utilities provided by the corresponding packages are installed into `/usr/heirloom/bin/` and `/usr/heirloom/lib/`. Some POSIX utilities are additionally provided in `/usr/heirloom/bin/posix/`.

| Name | Packages | Notes |
| [Toolchest](http://heirloom.sourceforge.net/tools.html) | [heirloom-cvs](https://aur.archlinux.org/packages/heirloom-cvs/) | Classical UNIX binaries corresponding to GNU [coreutils](https://www.archlinux.org/packages/?name=coreutils), [diffutils](https://www.archlinux.org/packages/?name=diffutils), [tar](https://www.archlinux.org/packages/?name=tar) and more, organized according to the different UNIX releases. |
| [Bourne shell](http://heirloom.sourceforge.net/sh.html) | [heirloom-sh](https://aur.archlinux.org/packages/heirloom-sh/), [heirloom-sh-cvs](https://aur.archlinux.org/packages/heirloom-sh-cvs/) |
| [Development tools](http://heirloom.sourceforge.net/devtools.html) | [heirloom-devtools-cvs](https://aur.archlinux.org/packages/heirloom-devtools-cvs/) | Tools like *yacc*, *lex*, *m4*, *make*, and *sccs*. This package, together with the Bourne shell, forms a foundation for the rest of the Heirloom packages. Using the classical devtools ensures consistent behavior, independent of any changes made to the corresponding GNU tools. |
| [Documentation tools](http://heirloom.sourceforge.net/doctools.html) | [heirloom-doctools](https://aur.archlinux.org/packages/heirloom-doctools/), [heirloom-doctools-cvs](https://aur.archlinux.org/packages/heirloom-doctools-cvs/), [heirloom-doctools-git](https://aur.archlinux.org/packages/heirloom-doctools-git/) | An alternative to [groff](https://www.archlinux.org/packages/?name=groff). |
| [mailx](http://heirloom.sourceforge.net/mailx.html) | [heirloom-mailx-cvs](https://aur.archlinux.org/packages/heirloom-mailx-cvs/) |
| [Packaging tools](http://heirloom.sourceforge.net/pkgtools.html) | [heirloom-pkgtools-cvs](https://aur.archlinux.org/packages/heirloom-pkgtools-cvs/) | A port of Sun SVR4's package management system, which was released as open source with [OpenSolaris](https://en.wikipedia.org/wiki/OpenSolaris "wikipedia:OpenSolaris"). |