Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
ANNO - ANNO is a city-building and economic simulation video game series, with real-time strategy elements.
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Stronghold - Stronghold Crusader is a RTS game from the series from Stronghold.
Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...
The Settlers Online - The Settlers is a free web browser based strategy game along with a gameplay that drops anywhere between Age of Empires and the online strategy style.