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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.
Most vendors do not publish their SDK to developers. However, you could try Onyx sdk if you want to inegrate their pen feature on BOOX devices. https://github.com/onyx-intl/OnyxAndroidDemo
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.