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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.
Jami Pro: open source, decentralized, no phone#, free-as-in-beer, Gnu Con: not Signal-compatible, still missing some features
Session Pro: open source, decentralized, compatible, no phone#, free-as-in-beer Con: needlessly uses a scammy cryptocoin $OXEN
If we are looking for an alternative to Signal, though, not fully decentralized isn't a new downside- you can just go off the matrix.org homeserver
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.