I believe you're correct according to the linked Github repo:
> Sloth is essentially a friendly, exploratory graphical user interface built on top of the lsof command line tool. The output of lsof is parsed and shown in a sortable, searchable outline view with all sorts of convenient additional functionality.
There should be more GUI's for the command line tools, imho. Imagine if we could get a parsable json from the cmd line tools that allows for a standard UI to be built ..
There's a cli/python utility called jc, which can parse some cmd line tool outputs (including lsof) and convert them to JSON (can also convert many file formats to JSON..)