Mihon - Free and open source manga reader for Android
Aidoku - Free and open source manga reader for iOS
Aniyomi - Aniyomi is an unofficial fork of the free and open source manga reader Tachiyomi that adds anime capabilities!
Tachiyomi - A free and open source manga reader for Android.
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.
TachiyomiSY - Tachiyomi is a free and open source manga reader for Android 6.0 and above, based off TachiyomiAZ.