MineClone 2
content.minetest.net
A survival sandbox game (work in progress!). Survive, gather, hunt, build, explore, and do much more. An imitation of Minecraft.

this is basically what a lot of people seem to expect base minetest to be, a reasonably fleshed out MC alternative.

to play, setup minetest 5.3.0 or later and install via content > browse online content.