OpenRCT2 - Game engine recreation of RollerCoaster Tycoon 2 adding new features.
Tropico - Tropico is an Addictive, Strategy, Construction and Management, City Building, Sandbox and Single-player Simulation developed by PopTop Software.
Parkitect - Build the theme park of your dreams, and keep it running!
Stronghold - Stronghold Crusader is a RTS game from the series from Stronghold.
Planet Coaster - Planet Coaster is an Adventure-based, Management, Strategy, Sandbox, Building, Single and Multiplayer Simulation by Frontier Developments.
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.