By the way, one thing I should note about Minetest: most mods are under a
libre license (usually WTFPL), but the Minetest forum's main mod section
permits restrictions on non-commercial distribution, and a small number of
mods have such a restriction.
Also, I haven't been successful convincing the maintainer of the "mod
database", which Minetest directly connects to, to only allow libre
licenses,[1] even though at least some of the Minetest developers agree with
me; it permits mods under CC BY-ND, CC BY-NC, CC BY-NC-SA, and CC BY-NC-ND,
which are all non-libre licenses. When I last checked, no mods under these
licenses were actually there, but this cannot be depended on.
This actually means we should have a modified version of Minetest in the
repositories of libre systems, because the Minetest distributed by its
developers has the potential to recommend proprietary software. In any case,
when playing Minetest now, you should take care to avoid the proprietary mods
that do exist.
[1]
https://bitbucket.org/iqualfragile/mmdb/issue/11/forbid-proprietary-software-explicitly
