Try Little Red Rover in the browser
Watch the robot move, then move each joint yourself within its real limits: the part it moves lights up. MuJoCo runs in your browser: nothing runs on Robotheca's servers, and no code from the repository runs.
Downloads 2.4 MB from GitHub, once: your browser keeps them for next time.
Files come from GitHub at commit 1509a7a: the URDF (SOFTWARE/ros2_ws/src/little_red_rover/description/rover/robot.urdf) and its meshes. Walking and balancing need the creators' own controllers and are not simulated here.
Model by @little-red-rover, from little-red-rover/little-red-rover at commit 1509a7a, read from GitHub in your browser. Hardware license: CERN-OHL-W-2.0; software license: LGPL-2.1-only. The simulation shows how the model moves, not how the real robot will behave.