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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.
Because we're specifically talking about Plex for Mac, Windows, and Linux, which, as you mentioned, is not the same as Plex HTPC or Plex Media Player. Both Plex HTPC and Plex for (Mac|Windows|Linux) are available to download here:
NOTE:
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Hence, a higher number means a more popular project.