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PolyMC
A custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once (Fork of MultiMC)
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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.
Mojang accounts broke for some launchers and I don't think MultiMC ever fixed it. PolyMC, a fork of MultiMC, on the other hand, did. That's the launcher I usually recommend these days. (Online play still doesn't work for Mojang accounts though, as the authentication servers no longer support that it seems.)
so basically Cuberite but more officially and with a rewritten client as well
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.