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AudioBookConverter
Improved AudioBookConverter based on freeipodsoftware release (mp3 to m4b converter)
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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.
So, I don't have an mp3 player to recommend, but I do have a piece of software you might find useful. Yermak's AudioBook Converter is my go-to tool for getting my audiobooks in the right format. I like to convert everything to .ogg with its most aggressive compression, because the books come out as a single, chapterized .ogg that's a quarter of the size and with little to no drop in audio quality. It also supports m4a/m4b and mp3, which may be easier to work with depending on your player.