Polar
Polar – free and open source cross-platform software for organizing and reading PDF files, capture web content, with support for adding annotations
Polar – free and open source cross-platform software for organizing and reading PDF files, capture web content, with support for adding annotations
Foliate – free and open source simple and modern eBook viewer for Linux desktop
Eplee is an ePub reader focused on reading without distraction with a simple and beautiful user interface (UI)
Lucidor – free and open source multitype software for reading and handling e-books
Peruse is a free multi-platform open source software for reading books and comics from KDE
KOReader an ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Cervantes, Kindle, Kobo, PocketBook and Android devices
Calibre is a free, open source cross-platform software for reading, converting, and organizing e-book collections
OpenComic – free and open source cross platform program for reading comics and manga
Komikku – online/offline manga reader for GNOME, developed with the aim of being used with the Librem 5 phone