This is interesting:
Some highlights from there:
* talk at FSCONS:
* Simple PCIe FMC carrier (SPEC):
All the design files are public, afaik without a license though.
Obviously this is very research-oriented and not commercial, but it
looks a lot more promising than Opencores (wrt technical quality and
spirit) and the usual LED-blinking "open hardware" things I won't
mention but you've all guessed.