This board supports all XBee modules including the Series 1 and Series 2.5, standard and Pro version. The highlight of this board is an FT231X USB-to-Serial converter. Theres also a reset button, and a voltage regulator to supply the XBee with plenty of power. In addition, there are four LEDs thatll help if you ever need to debug your XBee: RX, TX, RSSI (signal-strength indicator), and power indicator.
Resources

Schematic

Eagle Files

X-CTU Software

XBee Introduction and Buying Guide

XBee and X-CTU Hookup Guide

XBee WiFi Hookup Guide

GitHub(Design Files)