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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.
Actually, come to think of it, I would definitely agree that elementaryOS was a pioneer here. They were the first to have a platform library (Granite) with easy to use, advanced widgets for app creators to use. And they implemented the ability to buy software. Both of those things definitely helped the fact that elementaryOS has an unusually-large amount of custom software written for it, by passionate users.
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.