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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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omapsapp
🍃 Organic Maps is a free Android & iOS offline maps app for travelers, tourists, hikers, and cyclists. It uses crowd-sourced OpenStreetMap data and is developed with love by MapsWithMe (MapsMe) founders and our community. No ads, no tracking, no data collection, no crapware. Please donate to support the development!
It does not turn a smartphone into a dumbphone (I don't think that is even possible without removing entire parts of the system, possibly bricking the device) but the simpler and immediate interface makes it a lot more usable.
https://github.com/UriahShaulMandel/BaldPhone
A specific app which displays mapping data from OpenStreeetMap: https://organicmaps.app/