I2C Shield for Arduino Nano - RobotShop

Solarbotics Ground/Voltage/Signal Arduino Shield - RobotShop

Adafruit 16-Channel 12-bit PWM/Servo Shield - I2C Interface

Buy Nano Expansion Adapter - Shield for Arduino Botland - Robotic Shop

CAN FD Shield for Arduino, 9-Pin Sub-D, SPI, Selectable OBD-II/CAN

Solarbotics Ground/Voltage/Signal Arduino Shield - RobotShop

RS232/485 Shield for Arduino - RobotShop

Description Grove Shield for Arduino Nano Provides a simple way to connect with Arduino Nano Doesn't need jumpers or soldering Helps you to get rid of

Grove Shield for Arduino Nano

I2C Shield for Arduino Nano - RobotShop

Powerful Mega sensor shield (V2.4) for Arduino Mega. Large enough to carry up to 3 Xbee slots, 1 microSD slot and shield headers. Extended TTL connection pins for four Serial ports. DIP prototyping area to add more modules or electronic components. It is compatible with Arduino Mega boards/DFRobot megaADK/Arduino megaADK.

DFRobot Mega IO Expansion Shield for Arduino Mega

Elecrow NFC Arduino Shield - RobotShop