← Open-source alternatives
Open-source alternatives to Calibre
Free, open-source, downloadable replacements for Calibre
Multi-platform EPUB ebook editor — Sigil is a multi-platform EPUB ebook editor
alternative to Kindle Create、Calibre
6.9k+4/dayGNU General Public License v3.0WritingSigil-Ebook/Sigil
Ebook reader app for Android — Book Reader for Android
alternative to Calibre、SumatraPDF
4.8k+11/dayOtherReadersfoobnix/LibreraReader
EPUB desktop reader — A cross platform desktop reading app, based on the Readium Desktop toolkit
alternative to Adobe Digital Editions、Calibre、Koodo Reader
2.8k+1/dayBSD 3-Clause "New" or "Revised" LicenseReadersedrlab/thorium-reader