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.
Google Earth Flight Simulator - Google Earth Flight Simulator is an Addictive, Single and Multiplayer Flight Simulation that is specially made for those players who want to explore the beauty of the world.
X-Plane - The world's most advanced flight simulator just got an upgrade. Download the free demo today for Windows, macOS, & Linux.
Space Agency - Space Agency is a Simulation created by Noodles for mobile platforms such as Android and iOS.
GeoFS - Free, Web based flight simulator with worldwide satellite images.
YS Flight Simulator - YS Flight Simulator is a free flight simulator specifically for slow computers.