Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
EVE Online - Player-created empires, player-driven markets, and endless ways to embark on your personal sci-fi adventure.
Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
Empyrion - Empyrion is a 3D open world, space survival adventure in which you can fly across space and land on...
Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...
Avorion - Explore, build, fight, trad and mine in a procedural co-op space sandbox.