(Nuno Silva) writes:

Hello,

Does anyone know what might be the language/format used by Brother
MFC-3360C or any of the Brother printers listed below, and where could I
find its specification? Or if there is a free/open driver that works
with these printers?

It might (or might not...) be something called "Brother Native
Compression Mode (NCM)", but I can't find anything about this format.

As far as I know, the format is not PCL, Postscript or "Brother
Host-Based Printing".

Hi Nuno,
Afraid not, could not come up with anything on Google, nor the
Openprinting site, except one of the items on your list which was
mentioned as working perfectly with the Brother linux drivers (but a
paperweight without them).
Cheers,
Gernot Hassenpflug
--
NNTP on Emacs 25.2 from Windows 7