TeXmacs is an impressive project spanning several decades: https://www.texmacs.org https://www.texmacs.org It uses Guile as its scripting language and documen

TeXmacs is an impressive project spanning several decades: https://www.texmacs.org https://www.texmacs.org It uses Guile as its scripting language and documents created within TeXmacs are represented as Scheme programs. In addition to providing a LaTeX-quality WYSIWYG editor experience for scientific documents, TeXmacs can also be used as a computer algebra front-end for packages like Mathics, which provides an open-source implementation of the Wolfram programming language used in Mathematica: https://mathics.org/ https://mathics.org/