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!
Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
SurvivalCraft - SurvivalCraft is a mobile action and adventure game that is based on the wildly popular Minecraft platform.
Blockland - Blockland is a non-competitive multiplayer sandbox-style construction game. It's kind of like playing with legos on the internet.
Starbound - This action-adventure platformer throws you into a procedurally generated galaxy where you can make your mark.