Angstlr is another compiler compiler tool.
It convert the contents of the .anglr file into
a set of source files that constitute the core
parser for the programming language defined in this file.
Currently it generates only c# source files.
VSIX package contains:
compiler for .anglr files
VSIX extension for handling .anglr files
in MS VisualStudio (2022 or later)
VSIX extension supports syntax highlighting
and different views associated with .anglr files
editing of .anglr files is supported by Language
Server Protocol running in external process.
ANGLR is described in more detail on the website
angstlr.com, although this site is not yet final either.