Unallocated space on a reiserfs

WinHex supports ReiserFS, you can download the basic version for free. You should be able to view the whole disk & associated allocated and unallocated areas …

Note Not open source - but people use "open source" and "free to use" interchangeably - not sure which one you meant -)

My desire is to not purchase anything but will if I must.

I would expect that a Hex editor would be able to read any file am I correct? I think I could accomplish the same results using strings.

More specifically, I am looking for a sleuth kit’s fls command that will work on a reiserfs partition.

Whilst WinHex _is_ a hex editor, it has a fundamental understanding of ReiserFS, being able to look into the filesystem, showing existing files, and unallocated space.

I don't think that Sleuthkit supports ReiserFS at this point in time.