Apps similar to Apple Books include calibre, which is free and open source. Other options are Readest, KOReader, Project Gutenberg and Amazon Kindle. Ebook Readers like Apple Books are a crowded field, with more than 100 alternatives for Android, iPhone, the web, iPad and Windows.
dir2opds is a self-hosted OPDS ebook server that turns any folder into a digital library. No database, no Calibre—just point it at your book collection and browse or download via any OPDS-compatible ebook reader or web browser.
Canada
A native, lightweight macOS EPUB reader built around a document-first philosophy: Finder is your library, with full typography control and 100% offline privacy.
Fantasy Read helps you enjoy complex fiction without losing track of characters, places, and story details.
