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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.
I'm not completely sure, but ProtocolLib has a small tutorial on their plugin page. older tutorial: https://dev.bukkit.org/projects/protocollib/pages/tutorial newer but incomplete: https://github.com/dmulloy2/ProtocolLib/wiki I have only experience with NMS so far, so I can't really help much with ProtocolLib.
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.