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!
Virtual Photographer - 200 one-click preset Effects.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Fima effects pack - Fima effects pack includes 5 photo/video effects designed to help you make your scenes look stylish.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
ON1 Effects - ON1 Effects includes hundreds of stackable filters, presets, borders, and textures to help create...
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.