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LimboAuth
Minecraft Auth System for Velocity proxy built in virtual server (Limbo). Built with LimboAPI.
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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.
EasyAuth for fabric or LimboAuth for Velocity (proxy). I don't really know about Paper plugins and BungeeCord is simply worse that Velocity
NOTE:
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Hence, a higher number means a more popular project.