ANNO - ANNO is a city-building and economic simulation video game series, with real-time strategy elements.
FreeCiv - Freeciv is an open-source, turn-based strategy game based on Civilization II.
Stronghold - Stronghold Crusader is a RTS game from the series from Stronghold.
Sid Meier’s Civilization VI - Sid Meier’s Civilization VI is a Turn-based Strategy, War, Tactical, Single and Multiplayer video game created by Firaxis and published by 2K.
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.
C-evo - C-evo is a freeware empire building game for Windows