In the past few months, we have covered plenty of smart electrically driven robots like ANYmal here. That particular quadruped is ready for outdoor operation. It has a speed of 1 m/s and max payload of 10kg. You can program it to insect industrial sites and perform other challenging tasks.
Robotic Systems Lab has shared a video that covers what it takes to build a smart legged robot with ROS. You can find the case study here.