Assetto Corsa (Original)

Despite its age, the original Assetto Corsa remains a pillar of the PC racing community primarily due to its legendary modding support. With thousands of user-created cars, tracks, and graphical enhancements (like Content Manager and Custom Shaders Patch), the game is essentially a living platform. You can transform it from a basic sim into a hyper-realistic experience with modern lighting and physics. It is the most cost-effective way to get into high-end sim racing, provided you are willing to spend time installing mods.