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Gadgetbridge
Discontinued We are on codeberg.org now! https://codeberg.org/Freeyourgadget/Gadgetbridge - Gadgetbridge - A free and cloudless replacement for your gadget vendors' closed source Android applications. Supports Pebble, Mi Band, Liveview, HPlus and more.
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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.
See here and click on each watch individually: https://github.com/Freeyourgadget/Gadgetbridge . I've had various mi bands and they work similar to the official app from a feature set standpoint but different layout. I haven't tried other brands but they are probably good too.
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.