2 Free and Open-source E-book Apps for macOS (Intel and Apple Silicon)

1- Eplee

Sweet, simple epub reader

Eplee is an ePub reader focused on clean distraction-free reading experience with simple and beautiful UI.

Read about Eplee 's features, license, platforms, and more.

2- FBReader

eBook reader for ePub, Mobi, ETF, and Fb2.

FBReader is a popular eBook reader that supports many eBook formats such as EPUB, Mobi, ETF, and fb2.

FBReader is not an open-source software, but it is avaiable for free for Windows, Linux, macOS, Android, and iOS.

FBReader uses its own book parser and rendering engine. The engine is lightweight, fast, and highly customisable.

Read about FBReader 's features, license, platforms, and more.