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Paper
The most widely used, high performance Minecraft server that aims to fix gameplay and mechanics inconsistencies
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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.
From the evidence they are currently using Multiverse mods on a Paper server (they moved from Spigot when the EN server was added and they upgraded to 1.17.1). Rather than a proxy server solution like Bungeecord or Waterfall.
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.