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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Sonixd appears to be excellent client software: https://github.com/jeffvli/sonixd
Gonic (https://github.com/sentriz/gonic) is a very lightweight server with a subsonic API. But will not accept all your music in a single directory.
As far as servers go, /r/Navidrome is pretty lightweight, so is LMS
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.