OpenTTD

Yes, OpenTTD is a completely free and open-source transportation simulation game. It was originally created as a reverse-engineered clone of Chris Sawyer's 1994 commercial game, Transport Tycoon Deluxe. Because it is open-source, it is constantly updated and improved by a dedicated community of volunteer developers.

The primary objective of the game is to build and manage highly profitable railway and road networks to connect growing cities. Players transport passengers and various commercial goods, like coal and steel, between industries to earn money. The deep strategic gameplay involves optimizing routes and managing vehicle replacement to maximize financial efficiency.

Because it is open-source, OpenTTD has been officially ported to a massive variety of operating systems. Players can download and play it natively on Windows, macOS, and Linux. Dedicated community members have also made versions available on mobile platforms like Android.

OpenTTD introduces massive modern quality-of-life improvements and gameplay enhancements not found in the 1994 original. It features larger map sizes, an advanced pathfinding system for vehicles, and built-in multiplayer support for hundreds of players. Furthermore, it allows for easy installation of community-made mods, new vehicles, and custom maps via an in-game online system.