microsoft/AirSim

Supports software-in-the-loop simulation with PX4 and ArduPilot flight controllers, plus hardware-in-the-loop with PX4 for realistic vehicle dynamics. Provides language-agnostic RPC APIs (C++, Python, C#, Java) for programmatic vehicle control, sensor data retrieval, and training data generation, enabling code to transfer from simulation to physical vehicles. Includes specialized Computer Vision mode for camera-only workflows and weather simulation without vehicle physics.

18,015 stars and 4,700 monthly downloads. No commits in the last 6 months. Available on PyPI.