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Tuinity
Discontinued Minecraft server software fork of Paper to improve performance without behavioural changes.
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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.
According to the GitHub Repository, it hasn't been updated since Aug 27, 2021 (currently 15 months ago) and the Repository is Archived, which pretty much means you won't get any support there.
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.