IrfanView - IrfanView ... one of the most popular viewers worldwide.
ACDSee - ACDSee is an image viewer that uses very little system resources, and it has a small, sleek size that won't take up much space on your system.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
nomacs - nomacs is a free, open source image viewer, which supports mu
Polarr - MacOS, Windows, iOS, Android and online photo editing tools & free photo editors.