ReNamer - ReNamer is a very powerful and flexible file renaming tool, which offers all the standard renaming...
digiKam - Professional Photo Management with the Power of Open Source
Ant Renamer - Ant Renamer can rename large amounts of files and folders in few clicks.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Advanced Renamer - Video files.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.