OpenTTD - An open-source clone of the classic game ...
Railroad Tycoon - Railroad Tycoon is a very first installment in the series of Railroad Tycoon that was released in 1990 developed by MPS Labs and published by MicroProse.
Simutrans - Simutrans is an open-source transport simulator.
TheoTown - A City simulation game with great nostalgic graphics.
OpenRCT2 - Game engine recreation of RollerCoaster Tycoon 2 adding new features.
Cities: Skylines - Cities: Skylines is a Construction and Management, City Building, and Single-player Simulation developed by Colossal Order and published by Paradox Interactive.