OpenTTD - An open-source clone of the classic game ...
Transport Fever - Transport Fever is an Adventure-based, Management, Strategy, Economy, Sandbox, City-Building and Single-player video game developed by Urban Games and published by Gambitious Digital Entertainment.
Simutrans - Simutrans is an open-source transport simulator.
Rail Nation - Become a logistics tycoon in this fascinating railroad strategy game.
TheoTown - A City simulation game with great nostalgic graphics.
Pocket Frogs - Pocket Frogs is an Addictive, Hunter, Breeding, Training, and Single-player Simulation developed and published by NimbleBit LLC.