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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.
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Fossdroid-Core
Fossdroid Core is a web frontend of F-Droid: an alternative software repository comprising only free, open source software for Android. This repo is the open source version of fossdroid.com.
If you're at all considering it, I recommend downloading the version 1.xx installer and running it. Make up some fake passwords for fake websites, test it out, kick the tires. DO make sure you download it from the official site, though.
FOSS Droid
Standard Ebooks is a website that publishes free and open-source ebooks remastered for modern ereaders! Each book even gets its own specially chosen classic art cover :)