IrfanView - IrfanView ... one of the most popular viewers worldwide.
IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Aseprite - Aseprite is an art program dedicated to the creation of pixel art.
Seer - A Windows Quick Look Tool in Qt.
VistaCreate - The VistaCreate is a free and global digital platform which is known for sharing, searching, finding, and creating great art.