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DiaBLE
Discontinued Diabetes: test the FreeStyle Libre glucose sensors via BLE and NFC (Dexcom ONE/G7 soon, too).
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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.
It is possible to reconnect to an European Libre 2 from any Apple device, even an iPad and a Mac (very probably even from an AppleTV but I didn't test it) like I am proving with my personal project https://github.com/gui-dos/DiaBLE.
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.