Classic racing and flight sims such as Grand Prix Legends, Mig Alley/Battle of Britain and Falcon 4 are available for linux here: https://github.com/sim-museum

Classic racing and flight sims such as Grand Prix Legends, Mig Alley/Battle of Britain and Falcon 4 are available for linux here: https://github.com/sim-museum/esports-for-engineers https://github.com/sim-museum/esports-for-engineers (this is free, and does not use steam)