Minetest is a free open source alternative to Minecraft. The official account is:
You can also follow a Minetest world building project called Illuna:
There's also an unofficial Minetest video channel:
The actual Minetest app is available for Windows, Mac, Linux, Android and BSD from the official site at https://www.minetest.net/
This is a brand new server run by the main developers of the project as a spin-off of mastodon.social It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!