sosar - utility to manipulate SOS and ProDOS disk images
Hosted at the sosar Github repository.
Introduced in 1980, the SOS operating system for the Apple /// used a hierarchical file system, a significant improvement over the flat filesystems used on the Apple II (by Apple DOS, Apple Pascal, and CP/M).
In 1983, Apple introduced the ProDOS operating system for the Apple II family, intended to replace Apple DOS. ProDOS used the same filesystem as SOS.
sosar (pronounced like "saucer") is intended to provide a command line interface to manipulate SOS and ProDOS disk image files. As of this writing, sosar is only capable of printing the directory of such a disk image file.