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!
Viewnior - Very simple and fast image viewer. No support for IPTC metadata such as image tags/keywords.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
sxiv - Simple X Image Viewer. Contribute to muennich/sxiv development by creating an account on GitHub.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
nomacs - nomacs is a free, open source image viewer, which supports mu
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.