These 5 open-source apps prove you don't need to buy a Kindle or Kobo

You don’t need to buy a Kindle or Kobo to read ebooks—there are free, open-source options that can turn many devices into capable libraries. The list highlights five apps, led by KOReader, which works on Android, Linux, and also on jailbroken Kindle, Kobo, and PocketBook devices. KOReader is AGPLv3-licensed and supports many formats, including EPUB, PDF, MOBI, and even ZIP, and is described as DRM-free. Readest offers a modern EPUB/PDF experience across iOS, macOS, Windows, Linux, Android, and the web, with a KOReader sync plugin. Thorium Reader adds desktop-focused options on Windows, macOS, and Linux.