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Minetest is a FOSS alternative to Minecraft, and has just received a major update. Follow at:
➡️ @Minetest
It's available for Linux, Mac, Windows, Android and BSD from the official site:
The update makes it much easier to access game modes and mods. If you haven't tried it in a while, it might be worth another look.
Also check out this world-building project called Illuna:
https://share.tube/videos/watch/d84239ab-55c0-4c19-bf5e-e1dd6a7b4b17
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!