It's getting better! All the time! This was just posted yesterday.

The Battle for Wesnoth is my all-time favorite FOSS. Can't understate it.

I joined mander.xyz because it has a central theme around the natural sciences. It could possibly include STEM content as well; there is an ongoing discussion about it. The admin(s) are present and very responsive.

For anyone with a love of science and/or nature I recommend it highly as a home instance of Lemmy.