Stronghold - Stronghold Crusader is a RTS game from the series from Stronghold.
Clonk Rage - Real-time multiplayer game. Players can download more than 47475 maps at ccan.de
Tropico - Tropico is an Addictive, Strategy, Construction and Management, City Building, Sandbox and Single-player Simulation developed by PopTop Software.
Endless Sky - A space exploration and combat game similar to Escape Velocity
Age of Empires - Age of Empires is the critically acclaimed, award winning Real Time Strategy (RTS) game with a legacy spanning over 20 years and nearly a dozen titles in the franchise.
NAEV - Naev is a game about space exploration, trade and combat. Players travel the galaxy and earn money by trading, fighting and performing missions.