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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.
To buy bitcoin without ID, you can use Bisq (https://bisq.network/) or HodlHodl (https://hodlhodl.com/), although I'm not sure HodlHodl is available for Americans, if you are from there.
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.