Meet Minetest.

A free, open source voxel game engine and game. Fully extendable. You are in control.

Why Minetest? Download

NOTICE: Download goes to official Minestest site.

About

MPI is a group about getting people to play FOSS games. Minetest is a great subject for this. We are showcasing mods, showing people why they should play FOSS games, and encouraging a more open-source future.
Join us at minetest fourm post if you want to join.
You can play our server @ Doopy The Server. All of our showcased mods are installed there.

Why are we doing this? Look at this chart: As you can see, Minetest doesn't even have 1 point compared to Minecraft, the main block building game. Our goal is to get at least 2% search.