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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.
The term Ninja goes back to https://bob.nem.ninja/ ; Which is the place to download the NEM Core Protocol source code. Also, during a long period of time NEM used to be known for its "ninja releases". And more importantly, "Ninja" is actually the build system used for building the protocol source code (Catapult) as you can see here: https://github.com/nemtech/catapult-server/blob/main/docs/BUILD-manual.md#step-3-buildrebuild-catapult
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.