Honestly, anything fair trade.
Galler from Belgium is pretty amazing

Mastodon: fediscience.org , that’s for all kind of science. Sign-ups requirements are to give your ORCID (persistent identifier for scientist in case of name changes etc)

How does the Finnish course compare to Duolingo?

If you check the FAQ, it specifies that it’s sheered wool, as the sheep are not kept for meat or wool production but but for grassland maintenance.
They caveat that males need to be culled as only one can live in a herd, otherwise sheep get culled once they become unable to feed by themselves.
So the wool is a byproduct of sheep that would be kept anyway.

That takes care of the storage aspect, but what about the software running locally?
As far as I can see on the websites, they say that their services can be integrated into backup solutions, but they don’t tell what software to use

You joke, but dark “Esspapier” with “pencils” made out of some form of icing were a thing for a while. The pencils were a bit like crayons and writing sucked, but it did kinda work.

I just checked, you can get pens with food dye for decorating.