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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.
That all said, the current system is certainly not optimal (e.g. the minimum nomination amount) but it's being worked on, see https://github.com/paritytech/substrate/issues/9511 for some of the ways it is being improved now.
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.