The CM-900 is a Ardunio like servo control board from Robotis! "CM-900 Series is the embedded board with STM32F103C8 based on 32Bit ARM Cortext-M3 and its circuit diagram and the entire sources are open to public. At this very moment, CM-900 is developed and the prototype models are out in the market, and we plan to introduce newer version with bigger capacity in the future. If you think you can technically contribute to the development of this project, please request for the board and we will distribute the prototypes that are currently under the development for free."
I think this board is very cool and I have a lot of ideas on how to use it! It is a open hardware and software platform and you can get a development board for free!!!
Here is a link to the development website. LINK
The first two things I want to do is to connect it to the Raspberry Pi and then load the DARwIn-OP software on to Pi! The idea is to make a poor man's version of the CM-730 and FitPC setup that controls the DARwIn-OP!