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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.
Just to throw this out there though for anyone who might be interested in self-hosting their secret project audiobooks and others, to look at Audiobook Shelf. /r/audiobookshelf (what i'm doing) or set up plex to handle audiobooks (as best as it can) and use one of the players listed on that site, probably Chronicle on Android or Prologue for iOS.
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.