IrfanView - IrfanView ... one of the most popular viewers worldwide.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
MWSnap - MWSnap is basically a free to use Windows snapping tools that are used for snapping any part of the screen that is currently displaying on the front of all opened programs and windows.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...