Pocket Frogs - Pocket Frogs is an Addictive, Hunter, Breeding, Training, and Single-player Simulation developed and published by NimbleBit LLC.
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.
Theme Park Inc - Theme Park Inc is an Isometric, Construction and Management, and Single-player Simulation developed by Bullfrog Production and published by Electronic Arts.
Transport Tycoon Deluxe - Transport Tycoon Deluxe is a Business Simulation developed by Chris Sawyer and published by MicroProse.