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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.
IIRC, most of these generic eink devices are just running Linaro, which is technically open if a limited embedded system (kernel sources are definitely available, not sure how feasible it is to build the distro itself though). The i.MX 8 based readers are armhf so you should be able to debootstrap a chrooted debian on them (koreader 2022.02 release notes have an example for setting up a chroot).
It is not a complete operating system, though, just a document reader. But there have been distributions based on this, like okreader (which seems to be an abandoned project).
inkbox for kobo e-readers is great. It should be possible to port to other e-readers too
One thing to be careful about -- the first part of the SD card has the waveform calibration data for your specific device so you should back that up before doing anything too risky (MR to add support to postmarketos has more info on that).
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First E-reader. I am thinking of buying Kobo Libra 2?