The Arduino Ethernet Shield allows an Arduino board to connect to the internet. It is based on the Wiznet W5100 ethernet chip. The Wiznet W5100 provides a network (IP) stack capable of both TCP and UDP. The Ethernet W5100 Shield Network Expansion Board w/ Micro SD Card Slot supports up to four simultaneous socket connections.

Raspberry Pi 3 Model B Plus Board:

• The updated Pi 3 Model B plus design is based around a B plus Broadcom BCM2836 SoC, which includes a Quad-Core ARM7 900 MHz processor
• Processor: ARM7 900MHz CPU
• USB: 4 x USB Ports
• Ethernet: 10/100 Ethernet Port
• Video Output: HDMI and Composite
• Sound: L/R Stereo
• Memory: 1.4 GB Ram
• Operating System: Uses micro SD card slot to load  O/S
• Digital interfaces: 2 onboard ribbon slots for  Camera and Display
• GPIO: 40 GPIO pins, backward compatible to B  and B+ board
• Micro SD port for loading your  operating system and storing data
• Power Supply: External 5V
• I/O Operation Level: 3.3V
• Board Size: 85mm*56mm*1.6mm
• Only Model B plus board

Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano 3.x). It has more or less the same functionality as the Arduino Duemilanove but in a different package. It lacks only a DC power jack and works with a Mini-B USB cable instead of a standard one.