OpenTTD

OpenTTD is an open-source transport management and simulation game based on the classic Transport Tycoon Deluxe. It focuses on building profitable transportation networks using trains, road vehicles, ships, and aircraft, with both single-player and multiplayer modes.

Key Features

• Build and manage transport networks across procedurally generated maps
• Multiplayer gameplay for cooperative or competitive company management
• Extensive modding via NewGRF content and in-game online content downloads
• Scriptable AI and Game Scripts support (for custom AIs and gameplay scenarios)
• Broad platform support and long-term savegame compatibility across versions
• Frequent updates with UI improvements, new map generation options, and gameplay additions

Use Cases

• Hosting a persistent multiplayer server for friends or a community
• Creating custom gameplay scenarios with Game Scripts and mod packs
• Experimenting with logistics optimization and large-scale transport networks

Limitations and Considerations

• Requires separate graphics/sound base sets (downloaded or installed alongside the game)
• Multiplayer desyncs can be difficult to debug in complex modded setups

OpenTTD is a mature, feature-rich simulation game with a strong community and a long history of compatibility and mod support. It is well suited for both casual play and highly technical, large-scale sandbox simulations.