ANNO - ANNO is a city-building and economic simulation video game series, with real-time strategy elements.
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!
Stronghold - Stronghold Crusader is a RTS game from the series from Stronghold.
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
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.
Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.