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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.
https://elementary.io/. eOS is free, but it won't let you download it for free from the get-go. No, you are asked to BUY it first. Then, you see "custom" button, you press it, type in "0" and press "Download." Why it's so complicated?
https://builds.elementary.io/. Paid access to unfinished software? WTF? Who, when, what distro ever asked you to pay up front to let you download early builds of their software? Name me one. I'll wait.
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.