Open source server which runs locally. The hardware is long since discontinued (but plentiful and easily available on craigslist etc) and it can never be obsoleted as everything runs locally.
Plus Squeeze Network (still free, still working) for Pandora, Spotify, or other network services.
Have you tried squeezeplayer on a RPi with a DAC? It works great. I have one alongside my original Squuezebox. They sync perfectly for multiroom audio.
Open source server which runs locally. The hardware is long since discontinued (but plentiful and easily available on craigslist etc) and it can never be obsoleted as everything runs locally.