This shield V03 can achieve a simple two crunodal ZigBee network,achieve wireless communication between Arduino ,and allows the Arduino to wireless communicate over a modified ZigBee protocol using the popular XBee module.
This is a TFT LCD Adjustable Shield for Arduino Mega2560
This Ethernet Shield connects the UNO R3 board to the internet in mere minutes, connect them with RJ45 cable.
The module carries an onboard WIZnet W5100 Ethernet chip, which provides a network (IP) stack capable of both TCP and UDP, as well as a standard RJ45 Ethernet jack.
L293D is a monolithic integrated, high voltage, high current, 4-channel driver
Sensor Shield V4.0 for Arduino allows you to connect to various modules like sensors, servos, relays, buttons, potentiometers