I'm always slightly sad to see a reference to TeXmacs [1], while it is not developed anymore. Does anyone know why the project has been abandoned? Always amazed

I'm always slightly sad to see a reference to TeXmacs [1], while it is not developed anymore. Does anyone know why the project has been abandoned? Always amazed by the beautiful layout of the interface. [1] https://www.ceremade.dauphine.fr/~mgubi/tm-web/documents/tutorials/maxima-tutorial/maxima-tutorial.en.html https://www.ceremade.dauphine.fr/~mgubi/tm-web/documents/tut...