Symbolic mathematics on Linux

> Please note that GeoGebra as a complete software program would
> probably not be considered "free" software according to the
> definition of that term which is used by the Free Software
> Foundation. This is because the restrictions on commercial use that
> apply to the GeoGebra installers, web services and language files
> add-ons might be seen to be a restriction on the software as a whole
> (thus making it "non-free"), even though the GeoGebra source code is
> made available under the GNU General Public License without
> restriction.
(source: https://www.geogebra.org/license)

It will get interesting in case anyone ever tried to fork GeoGebra. I found one case of someone announcing a modified redistribution, but I don't think they succeeded: https://github.com/geogebra/geogebra/pull/5 .