Arduino Ethernet Shield include W5100.
Arduino Ethernet Shield2 include W5500.
This WIZnet Ethernet Shield with POE will include W5100S and POE.
W5100S is most new and most cheap and most powerful Hardwired TCP/IP chip in the world.
PoE(Power over Ethernet) describes any of several standard or ad-hoc systems which pass electric power along with data on twisted pair Ethernet cabling. This allows a single cable to provide both data connection and electric power to devices such as wireless access points, IP cameras, and VoIP phones.