XnView MP stands for Multi Platform = it is available for Windows, Linux and MacOS. It is a continuation of the older XnView Classic. In my opinion it is a great alternative to Windows photos app or any Linux image viewer that comes preinstalled. I even think it is an alternative to IrfanView. It is really fast and simple to use, supports more than 500 image formats, has built in folder browser, image converter, editor... AND MORE!
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Halide - A premium camera for your phone
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
NEURALCAM NIGHTMODE - NEURALCAM NIGHTMODE app helps photographers capture perfect photos in low light conditions without worrying about lights, brightness, and other factors.
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.
ProCamera - This Camera app lets you shoot RAW on your iPhone 7. Turn your iPhone into a powerful digital camera. ProCamera is an iOS photo, video and editing app!