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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.
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audible-cli
A command line interface for audible package. With the cli you can download your Audible books, cover, chapter files.
Source: I'm the creator of similar software Libation. We all do things pretty similarly behind the scenes.
inAudible used to be king but it hasn't been updated in 5 years and is sorely lacking in features.
For less convenient but powerful command line, there's this one, also free and open source.
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.