Qucs is a GPL circuit simulator. And if you want the GUI option ... Unfortunately there are only Windows versions available, and although some might have some success running it under WINE.
Follow these steps to use the Free Google Flight Simulator in Windows: Install the Google Earth application and launch it. Once the application opens, navigate to Tools > Enter Flight Simulator or ...
The current edition of the Microsoft Flight Simulator flight sim game franchise first launched in August 2020 for the PC, and later expanded to Xbox Series X and S consoles in July 2021 ...