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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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koreader
An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Cervantes, Kindle, Kobo, PocketBook and Android devices
There's Open Book open source e-ink reader. Not sure how usable it is. https://github.com/joeycastillo/The-Open-Book
The next model is planned to use the Raspberry Pi Pico microcontroller https://twitter.com/josecastillo/status/1356125145681846276
Something like this exists for the reMarkable: https://github.com/Evidlo/remarkable_printer
The Kobo.
Here is an exmaple of a Bash-based extension for the Kobo, which downloads files from cloud providers for you: https://github.com/fsantini/KoboCloud
And here is a forum with lots of people sharing tips and mods for it: https://www.mobileread.com/
Where are you getting that from? The github repo (https://github.com/koreader/koreader) lists many supported formats and features, including epubs.
Buy off Amazon, rip the DRM using https://github.com/apprenticeharper/DeDRM_tools/releases, and then read with KOReader on Kindle.
Not as a 1st party feature, but there are several open source tools for doing that: https://github.com/reHackable/awesome-reMarkable