This Ethernet Shield which is based on the Wiznet W5100 Ethernet Chip gives you an easy way to get your for Online. It is directly supported by for official Ethernet Library. It adds a micro-SD card slot, which can be used to store files for serving over the network. It is compatible with the for Duemilanove (168 or 328), Uno as well as Mega (1280/2560) and can be accessed using the SD library.
The Wiznet W5100 provides a network (IP) stack capable of both TCP and UDP. It supports up to four simultaneous socket connections. Use the Ethernet library to write sketches which connect to the internet using the shield.
This NFC / RFID shield is designed on the basis of a PN532 chipset and can be used for wireless communication at 13.56 MHz. Equipped with an integrated antenna and compatible with SPI, I2C, UART interface. Stacks directly on the VMA100 UNO card.