Development board Spartan-6

The Spartan-6 development board has a Wiznet W5300 which is an integrated Ethernet TCP/MAC/PHY Chip. The W5300 is a complete solution for simple & low cost 100Mbps network connectivity. it has internal physical layer, MAC layer and TCP/UDP/PPoE processor.

SPINet

You might be familiar with the WaveShare ETH E001 which provides triple UART connections via Ethernet.