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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 myself also don't use one on my V0. 😄 They are cool and can be helpful in some situations, but are not mandatory. A member of the community even created a phone app that connects to Moonraker (the API that makes Klipper visible on a network) called Mobileraker, it's available for both iPhone and Android smartphones. They can be obtained on the official stores, but if you want to live on the bleeding edge you can get the package on Github.
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.