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.
TheoTown - A City simulation game with great nostalgic graphics.
Rail Nation - Become a logistics tycoon in this fascinating railroad strategy game.
OpenRCT2 - Game engine recreation of RollerCoaster Tycoon 2 adding new features.