Adafruit boards
698 Adafruit development boards — pinouts, specs, and datasheets.
Adafruit · WIZ5500
A Featherwing that adds Ethernet connectivity via SPI and a single CS pin, suitable for various Feathers.
Xbee Radios
board
Adafruit
An Adafruit XBee Radios adapter board with breakout pins for various XBee modules, including power and communication interfaces.