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android-foss
A list of Free and Open Source Software (FOSS) for Android – saving Freedom and Privacy.
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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.
Additionally, check out https://github.com/offa/android-foss for a well orgainized list of FOSS apps for android. Otherwise you can use aurora store(preferred)/apkmirror/apkpure with a browser for non FOSS apps; not as great of a user experience, updates are manual for the latter two, but I try to stay away from non-FOSS as much as possible, so I don't suffer greatly.
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.