Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Age of Empires (series) - The Eso.com url/domain is going away on 7/23/2018. After that time, you'll need to access this site via agecommunity.com. Please update your bookmarks!
Starbound - This action-adventure platformer throws you into a procedurally generated galaxy where you can make your mark.
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.
Towns - The game brings a fresh new take on the city building/management genre by introducing many RPG features. In Towns you manage a settlement on top of an active dungeon.