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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.
XMPP messengers (e.g. yaxim are distributed along lots of servers, so there's one entity who can decrypt your data. However, encryption takes a few extra steps (unlike Signal, which is automatic). Most people don't use XMPP apps, so it won't serve to contact most people.
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.