Pollen Robotics (Hugging Face) Microduck

Microduck is a 25 cm, 800 g open-source biped robot sold for $399 that ships with four pre-programmed reinforcement-learning policies—including walking, sitting, kicking and roller-skating—and can be retrained via a GitHub-hosted SDK using MuJoCo simulation or Hugging Face Jobs. Users train policies in simulation, deploy them on the physical robot, refine the model, and share new behaviors through the community Discord, with full hardware specs (camera, LiDAR, two IMUs) and permissive Apache-2.0 licensing.