Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Fragment - A powerful image viewing suite with advanced metadata info
GIMP - GIMP is a multiplatform photo manipulation tool.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
ImageGlass - You can use Image to view your digital images and photos of many different formats.