Meet EPOR: an educational robot designed to teach you coding. It has an open hardware with detachable sensor, allowing the robot to grow with your kids as they learn more. Epor is Arduino UNO compatible. You can attach sensors and actuators for Arduino to do more with it.
EPOR offers autonomous driving, line tracing, camera for face, object, and gesture detection, sound detection, and Bluetooth support. Yet another cool STEM toy. You can find out more about it on Indiegogo.