There are a few others as well.

Syntax Diagram Generator https://lukaslueg.github.io/macro_railroad_wasm_demo/

GrammKit https://dundalek.com/grammkit/

DrawGrammar https://jacquev6.github.io/DrawGrammar/

There are other kind of text-to-diagram tools which I occasionally find (usually here on HN) and add in this list https://xosh.org/text-to-diagram/