Yomikiru is an offline reader for already downloaded comics, manga, webtoons and epub. Supports continuous vertical scrolling mode with no gap in between images. Supports drag and drop of files.
YACReader - Download YACReader for your platform. Windows, Linux, MacOSX. And enjoy you comic books cbr cbz with the best comic reader.
OpenComic - Open-source comic and manga reader for the desktop.
Mcomix - MComix is an user-friendly, customizable image viewer.
CDisplay Ex - CDisplay Ex is the most used comic book reader.
Tachiyomi - A free and open source manga reader for Android.
NoFasel - A streaming app with no ADs.