Fragment - A powerful image viewing suite with advanced metadata info
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Phiewer - Image Viewer - Phiewer is the easiest and fastest way to view your images, videos and even audio files.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
LightShot - The fastest way to take a customizable screenshot.