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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.
Anyway, there is a growing number of potential competitors such as dim and Olaris Media Server but as of right now there isn't an alternative that I would consider to be equal to plex, however I think we're getting close, it might be another year maybe two before we see any real competition, it mostly depends on how fast the alternatives can be developed.
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.