OpenBMC is free software, used by POWER9 systems, in particular. I haven't used it, but I think it's in the Summit and Sierra supercomputers as well as TALOS s

OpenBMC is free software, used by POWER9 systems, in particular. I haven't used it, but I think it's in the Summit and Sierra supercomputers as well as TALOS systems. IPMI/BMC implementations are a nightmare, and something you can potentially fix has considerable appeal.