KOReader is an ebook reader application supporting many formats, running on Cervantes, Kindle, Kobo, PocketBook and Android devices
KOReader is actually intended to replace your existing ebook reader software that runs on a Kobo or Kindle ereader. For Kindles, this will also mean you have to jailbreak them. But it can also install on Android, Linux and other OSs.
It does provide a much richer and more customisable experience than Kobo or Kindle offers, and the real power also kicks in with plugins that enable Wallabag read-it-later service, RSS news feeds, integration with Calibre, etc.
It supports fixed page formats (PDF, DjVu, CBT, CBZ) and reflowable e-book formats (EPUB, FB2, Mobi, DOC, RTF, HTML, CHM, TXT). Scanned PDF/DjVu documents can also be reflowed with the built-in K2pdfopt library. ZIP files are also supported for some formats.
The linked article below gives some feedback on usage experience, but I have also provided the link to the source code site of the product. If you want to see it in action, you can watch some videos on Stefan Svartling's channel.
See
https://matija.suklje.name/trying-out-koreader-and-wallabag-the-first-few-days-and-months and
https://github.com/koreader/koreader#
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koreader