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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.
For example, here is the code source for the Android mail app. Is is released under GPL-3.0 which **basically** says "you take use this for whatever you want, but it must also be released under GPL-3.0.".
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.