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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.
Recently some devs have been complaining about the fact companies doesn't support their projects while profitting with them (see: https://github.blog/2019-01-17-lets-talk-about-open-source-sustainability/, https://github.com/chrisdutz/blog/blob/main/plc4x/free-trial-expired.adoc, or what happened with Marak).
And re licenses, check this out: https://github.com/mrjoelkemp/awesome-paid-open-source
a lot of various one: FTSL, APL, ACSL, Fafol, etc.
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.