Open Source Tycoon & Simulation Games Projects
Business and management simulation games where players build and run systems.
OpenRCT2
An open-source reimplementation of RollerCoaster Tycoon 2 that expands the original with new features, rides, and multiplayer.
Alternative to: 
RollerCoaster Tycoon
RollerCoaster Tycoon
OpenTTD
An open-source simulation game based on Transport Tycoon Deluxe, letting you build and manage a vast transport empire.
Alternative to: 
Transport Tycoon
Transport Tycoon