Official Documentation: Radds Doku
A nice, sadly not 100% Open, controller board with optional extension board that can controll 6 (with extension board up to 9) independent stepper motors. Usually running ontop of a Arduino Due 32bit Board, so it has plenty of performance to controll all Railcore Aspects. as an alternative to Arduino Due + Raspberry Pi, it could also be mounted ontop of the not so known Udoo Dual / Udoo Quad boards that have an Arduino Due compatible Chip and pinout combined with a ARM Dual/Quad core on a single board.
The Radds can run on 12 or 24 Volts and is quite Flexible in terms of conectivity.