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.
World of Airports - World of Airports is a Management, Strategy, Simulation, and Single-player video game developed by Haugland.
GeoFS - Free, Web based flight simulator with worldwide satellite images.
Unmatched Air Traffic Control - Unmatched Air Traffic Control is an Adventure, Flight Simulation, and Single-player video game introduced by Vector 3D studio.
X-Plane - The world's most advanced flight simulator just got an upgrade. Download the free demo today for Windows, macOS, & Linux.
Airlines Manager – Tycoon 2021 - Airlines Manager – Tycoon 2021 is an Adventure, Strategy, Business Simulation, Management, and Single-player video game by Playroom.