X-Plane - The world's most advanced flight simulator just got an upgrade. Download the free demo today for Windows, macOS, & Linux.
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.
Digital Combat Simulator - Digital Combat Simulator is a Free-to-play, Single and Multiplayer Combat Flight Simulation developed by Eagle Dynamics and published by The Fighter Collection.
Tom Clancy’s H.A.W.X 2 - Tom Clancy’s H.
Air Combat - Air Combat is an Action, Open World, Single, and Multiplayer Combat Flight Simulation created and published by Namco.
Ace Combat: Assault Horizon - Ace Combat: Assault Horizon combines the elements of Action, Military-themed, Arcade, and Flight Simulation developed by Namco and published by Namco Bandai Games.