Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
YACReader - Download YACReader for your platform. Windows, Linux, MacOSX. And enjoy you comic books cbr cbz with the best comic reader.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Tachiyomi - A free and open source manga reader for Android.
GIMP - GIMP is a multiplatform photo manipulation tool.
Mcomix - MComix is an user-friendly, customizable image viewer.