Flight simulators have been a staple of PC gaming since the launch of the original Microsoft Flight Simulator in 1982. Here's a list of the best free flight simulators to test your flying skills.

FlightGear is an open-source flight simulator that has been in development since 1997. Not only is the game free, but you can also contribute to the project. While the 3D environments built into the game are limited, there are thousands of regions and airports available for download from the FlightGear website. FlightGear is available for Windows, macOS, and Linux.

Aces High III is a World War II flight simulator that offers free offline play and a competitive multiplayer mode where hundreds of players battle each other simultaneously. You can choose from 50 planes, tanks, carriers, and cruisers from six different nations. There is a subscription fee for multiplayer, but the game comes with a two-week free trial. You can download the game from the official website or from Steam.

GeoFS is a web application that runs in almost any browser. You can choose from a variety of flying vehicles, including a multi-engine jet, a classic propeller plane, a helicopter, a hot air balloon and even a paraglider. In addition to a handy online manual, GeoFS has a map that keeps track of all the pilots currently playing the game, so you can arrange to meet up with your friends and explore the virtual world together.