Thorium Reader is described as 'free, open source multi-language EPUB reader for Windows 10, MacOS and Linux. It's privacy aware and highly accessible for visually impaired and dyslexic people' and is a eBook Reader in the News & Books category. There are more than 10 alternatives to Thorium Reader for a variety of platforms, including Windows, Android, Mac, Android Tablet and iPhone. Most alternatives are eBook , PDF Readers and eBook Libraries. The best alternative is SumatraPDF, which is both free and Open Source. Other great apps like Thorium Reader are calibre (Free, Open Source), Amazon Kindle (Free), FBReader (Freemium) and Document Viewer (Free, Open Source).