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koreader
An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Cervantes, Kindle, Kobo, PocketBook and Android devices
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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.
The author seems to have missed KoReader (http://koreader.rocks) and Plato (https://github.com/baskerville/plato), both of which are not user-hostile and work on Kobo and ReMarkable.
This blog post being on a .de url is somewhat ironic.
The German ebook market is quite different. You can easily get DRM-free ePubs of most current books in German, most of the time only with a watermark. I don't know how large Amazon's market share is (I guess it is still very big) but you have other, viable options besides them.
If you really want to read on a Kindle (it is a very well designed piece of hardware after all) jailbreaking it and putting koreader on it, is an option: https://github.com/koreader/koreader/releases/
But also tell the publishers whose books you wanted to buy that you would have bought from them if you got it DRM free. I can't understand why so few publishers to this.
Their margin would much bigger and Amazon's DRM is just token security. It's easily broken. Calibre does this automatically for crying out loud).