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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
https://github.com/Kobo-InkBox/inkbox#readme appears to be the non-ddns.net version, and is GPLv3
Kobos are fantastic. I don’t think they took off outside of Canada unfortunately.
Last time I was at Value Village I saw a handful of them for $5 each. I picked up a couple of them and turned one into a weather station[0]. Took under 5 minutes including mounting it.
[0]: https://github.com/brunolalb/yawk
For any Kobo (as well as Kindle & PocketBook) owners considering stock firmware alternatives, there's also [KOReader](http://koreader.rocks/)l