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!
Volt - Volt is a reactive web framework where Ruby code runs both on the server and the client (via opal).
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Grid50 - The Marketplace for Photographers & Videographers
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
KitSplit - Airbnb for creative equipment - rent cameras, drones & more
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.