Reminds me mostly of LyX [0], although that one does use LaTeX and Tex; and targets a WYSIWYM approach [1]
[0] https://www.lyx.org/
[1] https://en.wikipedia.org/wiki/WYSIWYM
Superior to LyX: fully WYSIWYG, no limitation on what it can do.
alt Hacker News
Superior to LyX: fully WYSIWYG, no limitation on what it can do.