Arduino is a massive ecosystem, if there's a way for the Raspberry Pi GPIO interface to adapt to Arduino pinouts, it is possible to use the Pi together with vast Arduino shields and hardware/software resources. The ARPI600 is just intended for this. What's more, the ARPI600 also support XBee modules, make it easy to add wireless feature to your great...
The ESP8266 WiFi Bee from DFRobot is designed for Arduino, and makes ad hoc networking easy via low-power, low data wireless communications.
This fantastic little XBee Shield is perfect for connecting your Arduino projects to XBee, to control swarms of busy electronics from a central hive.
The XBee S2C ZigBee Module is an XBee module that has been loaded with ZigBee firmware, to create robust, interoperable mesh networks.
Core2530 is a ZigBee module based on CC2530F256, and the extension interface is compatible with XBee.
CC2530 Eval Kit5 is a ZigBee development/evaluation kit based on CC2530, which also supports XBee connectivity. The kit consists of the base board XBee USB Adapter and the ZigBee module Core2530 (B).