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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
Certain PDFs can be read quite comfortably on an e-ink reader once reflowed with K2pdfopt (https://www.willus.com/k2pdfopt/). KOReader (https://koreader.rocks/) will do this for you, one of its killer features
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InfluxDB
InfluxDB high-performance time series database. Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.
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Have you tried a reMarkable tablet?
https://remarkable.com/
It's a 10.3" e-ink device with a really nice touchscreen surface that supports low-latency, high-precision writing using a stylus. It's Linux-based and is highly hackable with lots of open-source projects:
https://github.com/reHackable/awesome-reMarkable
It seems to stand alone....
Yay e-ink, boo GPL violations.