Corundum: An Open-Source 100-Gbps NIC, FCCM'20 [pdf]

Github: https://github.com/ucsdsysnet/corundum

Reddit: https://www.reddit.com/r/FPGA/comments/ejd08o/corundum_opens...

IMHO, this is probably THE best FPGA network stack out there. It has no commercial IPs whatsoever, everything including MAC is simple and high-quality Verilog. The beauty is that it works on so many xilinx boards out of box.