FreeCiv - Freeciv is an open-source, turn-based strategy game based on Civilization II.
Astro Empires - Astro Empires is a Playable, Massively Multiplayer Online, Real-time Strategy, Space and Browser-based video game developed and published by Cybertopia Studios.
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.
Command and Conquer - Are you ready for the ultimate real-time strategy experience? Gather resources, build your base, and create the most powerful armies in the world before engaging the enemy in all-out war.
C-evo - C-evo is a freeware empire building game for Windows
Homeworld 2 - Homeworld 2 is an Adventure, Real-time Strategy, Space, Single and Multiplayer video game developed by Relic Entertainment and published by Sierra Entertainment.