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sms-ie
SMS Import / Export is a simple Android app that imports and exports SMS and MMS messages, call logs, and contacts from and to JSON / NDJSON files.
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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.
I've long been irked by the lack of an available, straightforward, FLOSS SMS import / export app, so I tried my hand at teaching myself Android development and writing one - introducing SMS Import / Export.
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Hence, a higher number means a more popular project.