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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.
Vendors have been selling you open-source software since the '80s. Here's macOS 13.2's open-source components. Darwin isn't really a thing any more, but around half of what Apple doesn't distribute any more is open source as well.
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.