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!
Bulk Rename Utility - Bulk Rename Utility: Free File Rename Utility for Windows. Bulk Rename Utility allows you to easily batch rename files and folders based upon many flexible criteria. Free Download.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
ReNamer - ReNamer is a very powerful and flexible file renaming tool, which offers all the standard renaming...
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
Ant Renamer - Ant Renamer can rename large amounts of files and folders in few clicks.
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.