Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Starbound - This action-adventure platformer throws you into a procedurally generated galaxy where you can make your mark.
Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...
Dig or Die - Dig or Die is a sandbox action/strategy game; explore, fight, craft, and build your defenses!
Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
Deepworld - Deepworld is a massively-multiplayer 2D crafting adventure game.