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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 don't know the default behavior of Trezor's software, especially on Mac, however a quick look at their github and the fact that its listening on port 21325 appears normal.
NOTE:
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Hence, a higher number means a more popular project.