The only "cool" player is Microchip, who have been providing full datasheets, register maps, and open sourcing their drivers for years now. But I'm under no illusions they're doing this out of the goodness of their heart, they're doing it because it's one of very few competetive advantages available to them.
(Which is perfectly fine! FOSS drivers are a great competetive advantage! It's not working super well sadly :/ — but part of the problem here is Broadcom's anticompetetive behavior. To my knowledge, any switch OEM producing Broadcom-based gear will get their NDAs and silicon access revoked if they so much as dream about making devices with non-Broadcom silicon.)
¹ Intel has already exited this business some while ago, they only bought Fulcrum Micro to get better NICs basically since every NIC is nowadays also a switch. Tofino was always a "special beast", not quite competing against e.g. Qumran or Trio. Tofino is (was?) better thought of as special purpose FPGA…
