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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 recommend not relying on authoritative opinions, but using reliable e2e encryption https://xmpp-servers.404.city/ Many operators who position themselves as private and secure do not follow even basic security rules and make exceptions to the rules despite the signing of the manifest https://github.com/E-404/Manifestos/blob/master/1.md
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.