Re: redisplay system of emacs

[Richard Stallman]

    Emacs is contributing in the sense of providing a swiss knife to
    produce free software, but not in the sense of being free software.

You are factually mistaken.  Emacs is free software, and people take
advantage of that freedom with their modified versions.

The term "ecosystem" is best avoided because it supposes an
amoral stance.  See http://www.gnu.org/philosophy/words-to-avoid.html
for the explanation.