Minetest is a FOSS alternative to Minecraft, and has just received a major update. Follow at:
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:
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!