MORSE is a generic simulator for academic robotics. It focuses on realistic 3D simulation from small to large environments, indoor or outdoor, from one to tenths of autonomous robots and can be entirely controlled from the command-line. Simulation scenes are generated from simple Python scripts.
MORSE comes with a set of standard sensors and actuators such as cameras, laser scanners, GPS, speed controllers, high-level waypoints controllers, generic joint controllers, and so forth. It also has robotic bases as quadrotors, generic four wheel vehicles, and new ones can easily be added. This simulator is based on the Blender Game Engine for rendering and the Bullet engine for physics simulation.
https://morse-simulator.github.io/

By offering a controlled environment to practice, simulations allow educators and students to experiment, receive feedback, and improve their skills without the immediate consequences of working with real-robots.