The best alternatives to flatcat are Starship, Bittle, and Dash & Dot. If these 3 options don't work for you, we've listed a few more alternatives below.
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Bring down the technical and cost barriers of dynamic quadruped robot to an open-source pet. Petoi Bittle is a tiny but powerful robot that can play tricks like real animals. We fine-tuned every bit to fit agile maneuverability into a palm-sized robot pet.