Librum
Librum is a program for reading and organizing e-books. A free and open source program
Arianna
Arianna is an application for reading and organizing e-books. A free and open source program
Koodo Reader
Koodo Reader is a program for reading and organizing e-books with the ability to synchronize and backup. A free and open source program
CoolReaderNG
CoolReaderNG is a fast and simple e-book reader. A free and open source program
Alexandria
Alexandria is a minimalistic cross-platform reader for reading e-books. Free and open source program
YACReader
YACReader – reading, viewing and managing a collection of comics. Free and open source program
ComicReaderUltimate
ComicReaderUltimate is a program for reading comics in CBR, CBZ or JPEG format. Multiplatform free and open source program
Comic Sticks
Comic Sticks is a free and open source program for reading comics from the xkcd service for Linux
Manga Reader
Manga Reader is a free and open source program for reading manga/comics from a local library
Buka
Buka is a book manager with a simple and minimalistic user interface for organizing and reading PDF books