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.
Hi one of the paper authors here. Most of the discussions here center around the legal concern rather than the project itself. We are working on that. But for now we decide to take down the website first. Sorry for the inconvenience folks and thank you all for the input.