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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.
i2pd is a router that presents API's to adapt applications with, the built-in applications it has are extremely minimal. That's their thing. They have a separate browser distribution which is probably what you need. I have other options if you don't want that one but if you intend to use i2pd, then probably also use their browser.
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.