Learn more about Alligator board or get your own unit at:
https://www.indiegogo.com/projects/alligator-board-professional-3d-printer-controller
Best of all: Alligator is open source hardware!
Alligator Board Repetier Firmware on Github
Alligator Board Design Files on Github
Download Alligator Board User Manual
Download Alligator Board Wiring Scheme