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signal-cli
signal-cli provides an unofficial commandline, JSON-RPC and dbus interface for the Signal messenger.
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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've seen there's some kind of API of you give it its own number https://github.com/AsamK/signal-cli
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Hence, a higher number means a more popular project.