There is another Minecraft-like called Vintage Story, which I like a lot. I love the effort that the Minetest team is making but the game's development doesn't seem to be going anywhere as of right now due to a lack of direction. I feel being a game that is fully open source is not doing any favors.

I don't know if it's possible under license but it might be able to pick up some steam if a large, for-profit mod came along.