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Throwing this out here - Airsonic is the current FOSS iteration of the software https://airsonic.github.io/

Subsonic went closed, and the rebrand to LibreSonic had some unrest with the maintainer, so Airsonic is leading the way in the line of *Sonics.

Or if you want something that can run easily on a RaspberryPi but still gives you Subsonic compatibility, try https://github.com/sentriz/gonic

This is a great link, I've been looking for a pi project and a music server sounds really spiffy.