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.
PixelFlow - PixelFlow app is a video editor app that comes up with an extensive collection of more than 25 different animated text templates so you can make an intro for your video project.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
Posteroid - Posteroid app offers features that let you turn your images as well as text into a graphic poster so you can share them on various social media platforms to enjoy them with friends.
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.
JPEG-Repair Toolkit - JPEG-Repair Toolkit is a utility for repairing corrupt photos.