If you are looking for a free drone simulator, you are likely looking for or JSBSim , which are open-source alternatives that offer
: It is used to find the economically optimal expansion policy for electric utility systems over a long period (up to 30 years) while meeting reliability and environmental constraints. International Atomic Energy Agency Architecture : The latest version of 64-bit application compatible with Windows, Mac OS X, and Linux. Key Features Graphical User Interface (GUI) wasp iv 64 bit free
Locate the "Download" or "Trial" section and submit a request for a evaluation license. If you are looking for a free drone