Miru Project - A versatile application that is free, open-source, and supports extension sources for videos, comics, and novels, available on Android, Windows, and Web platforms.
NeeView - Display two images simultaneously
TachiyomiAZ - Free and open source manga reader for Android
ComicFlow - ComicFlow is an iOS app that allows you to read comics by opening .cbr or .
Aniyomi - Aniyomi is an unofficial fork of the free and open source manga reader Tachiyomi that adds anime capabilities!
ComiXed - ComiXed seeks to be the ultimate digital comic book management system.