[fifteenth]

I agree completely. The other two games in esports-for-engineers are open source, while the GPL demo is free but not open source. (I didn't have enough space to explain this distinction in my one-line hacker news post.)

iRacing is certainly more accurate than GPL, but that's an apples to oranges comparison because these sims have different goals, and both are great at what they do. If you are preparing to compete in real-world car racing, by all means sign up for iRacing (after reading the excellent and funny book "You Suck at Racing"). If you are an engineer, and like to learn about car physics by adjusting the car settings in GPL Race Engineer and then seeing the results in GPL Replay analyzer (both included at the github link), then GPL is a fine choice. There's a lot to be said for a simple, elegant game design that provides an immersive experience; By that measure I submit that all three games on the esports-for-engineers github page deliver.