ReNamer - ReNamer is a very powerful and flexible file renaming tool, which offers all the standard renaming...
Beyond Compare - Beyond Compare allows you to compare files and folders.
Ant Renamer - Ant Renamer can rename large amounts of files and folders in few clicks.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Advanced Renamer - Video files.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.