The short answer is: no - the longer is: I am not aware of any commercially available ones. Even though RISC-V got some traction recently. Under the line the design itself might be open-source, but the actual (IC) layout could be troublesome to be open-sourced due to NDAs. It's surely not the right point to go into more detail here. But on the other side: it's not really easy to get these certifications, although I am not aware if schematic/design/layout reviews are included for these. Also I would not condemn a product across the board just because it is proprietary - at least an indication for such a judgement would be necessary from my point of view. Nevertheless, generally we would also be happy to see this as Open-Source then we wouldn't have to have this discussion.