There are four poles to each of these coils, and they plug right into a standard stepper driver, so to control this board all you need is a basic Arduino and a motor shield. Or a RepRap board ...

grbl is stepper motor controller firmware for three-axis cnc machines ... circuit for folk to add to typical commercial grbl boards With grbl, both limit switches for any axis are wired to the same ...

The purple boards slotted into the pairs of SIL headers are Pololu Stepper motor drivers ... out all of the connections to the limiting switches (two for each axis), spindle and coolant control ...