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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.
F-Droid is for app delivery in general. Only apps from the official f-droid repository are guaranteed FOSS. Third party repos can provide any app they'd like, even proprietary ones. The (unofficial Firefox)[https://gitlab.com/rfc2822/fdroid-firefox] repo for example provides Spotify even though it is not FOSS. If you just have it for Firefox, a FOSS fork is also available in the official F-Droid repo, but under the name "Fennec".
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.