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!
Salsa - Anonymous messages in your workplace
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Bebop - Bebop provides a nice web interface to a list of publications stored in a BibTeX file.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
Flaneer - Flaneer provides Virtual Machines for Game Studios, Post-Production video agencies and Engineering companies. Make Unreal Engine, Premiere Pro and Revit way faster and collaborate on projects with your team !
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.