Thorium Reader

Thorium Reader is a free, highly accessible, multilingual and multi-format reading application. It has a modern user interface with no ads or private data leakage. This application is one of the best EPUB 3 readers on the market; you can also read PDF or DAISY files and listen to audio books. Thorium Reader supports Readium LCP DRM-protected publications borrowed from public libraries or purchased from booksellers' websites. This open-source project from the European Digital Reading Lab is constantly evolving: please help with its development at https://github.com/sponsors/edrlab. And don't forget to leave a review on this site!

Functionalities:

Supports EPUB 2, EPUB 3, PDF, DAISY, LPF formats. Allows you to easily manage your library of books and audio books. Allows you to navigate through books and audiobooks by their table of contents. Allows you to read in paginated or scrolled mode. Has sepia and night themes. Allows you to finely modify the presentation of texts. Allows you to zoom in on the images contained in EPUBs. Allows you to read the text aloud. Manages EPUBs associated with an audio track. Provides full-text search capabilities. Allows bookmarks to be placed in the text and bookmarks to be named. Supports LCP DRM. Compatible with NVDA and JAWS screen readers. Supports MathML. Provides access to OPDS-formatted book catalogs. Interfaces with your Calibre library via its OPDS feed. Allows you to classify your books via personal labels.