FreeCiv - Freeciv is an open-source, turn-based strategy game based on Civilization II.
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.
C-evo - C-evo is a freeware empire building game for Windows
Empires! - Empires! is a real-time strategy game about building and ruling a historical empire.
Widelands - Widelands is a free, open source real-time strategy game with singleplayer campaigns and a...
UnknownHorizons - A 2D realtime strategy simulation with an emphasis on economy and city building. Expand your small settlement to a strong and wealthy colony, collect taxes and supply your inhabitants with valuable goods.