Here is a smart motor that you can use to build your own robots. The Robodyn motors lets you build robots with 300mm range of motion and 1kg payload. You can use these to build delta robotic arms and Scara arms. The motor has dual magnetic enclosure sensors. It supports Windows and Linux. These motors are ready for Python and C++ programming.
This motor weighs only 360g. It has speed, position and torque control modes. You can find out more about it on Kickstarter.