These tools allow you to test drone designs in a simulated environment before actual flight: X-Plane: A high-quality flight simulator that supports drone simulation and is used by professionals to test drone flight behavior.

Gazebo: An open-source simulation tool for testing and developing robotic systems, including drones. It integrates with ROS (Robot Operating System) and can simulate various environments.

Real Flight: A flight simulation software specifically designed for RC planes and drones. It provides a virtual environment to practice flight maneuvers.

Drone SimPro: A drone-specific simulation software that offers realistic flying scenarios         and training environments.