FlightGear - The FlightGear flight simulator project is an open-source, multi-platform, cooperative flight simulator development project. It also simulates space flight in Earth's orbit. It's flight dynamics engine (JSBSim) is used in a 2015 NASA benchmark.
BeamNG.drive - BeamNG.
X-Plane - The world's most advanced flight simulator just got an upgrade. Download the free demo today for Windows, macOS, & Linux.
Rigs of Rods - Rigs of Rods is a Physics-based, Puzzle, Driving and Single-player Simulation.
GeoFS - Free, Web based flight simulator with worldwide satellite images.
My Summer Car - My Summer Car is an Adventure-based, Open-World, Racing, Driving and Single-player video game developed and published by Amistech Games.