Yeah, I'd say yEd fits into the same category the author noted at the very beginning: It's a graphical tool for creating graphs. yEd does support several file f

Yeah, I'd say yEd fits into the same category the author noted at the very beginning: It's a graphical tool for creating graphs. yEd does support several file formats to import, some of which are text-based, e.g. TGF, but they're not terribly convenient to input directly. And indeed, yEd is free, but intentionally lacks mechanisms (and the permission) of automating it. Those use cases are usually far better served by licensing the underlying graph drawing/analysis/layout library.