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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.
You could also try croc, a tool to send files encrypted from one system to another, with a public relay as fallback if they have a "firewall" in between. Also available in Termux if you have that installed in the Android VM, or there's also an App with GUI on Fdroid.
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.