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LibrumThorium Reader
Free

Free and open source.

 Free

The open-source software is available without a license fee. Hosting, hardware and…

Windows, macOS, Linux Windows, macOS, Linux
  • Reader and library manager in one app
  • Runs on several desktop platforms
  • Supports library imports, bookmarks and adjustable reading layouts.
  • Sync depends on the project's service
  • Smaller project than established readers like Calibre
  • Format and protection support depend on the book being opened.
Downloadable app Downloadable app
Open source Open source
License: GPL-3.0 License: BSD-3-Clause
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.