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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.
i2p-bote https://github.com/i2p/i2p.i2p-bote is supposed to be the answer with a truly decentralized anonymous (to which point?) messaging system over the i2p network. The project hasn't been updated for a while though.
NOTE:
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Hence, a higher number means a more popular project.