A portable file rename tool. File rename tool can rename, lowcase, upcase large numbers of files. It's a quick and powerful tool written in C with extended regular expression supporting for searching and substituting pattern strings in filenames.
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KRename Alternatives
KRename is described as 'Powerful batch renamer for KDE. It allows you to easily rename hundreds or even more files in one go. The filenames can be created by parts of the original filename, numbering the files or accessing hundreds of informations about the file, like creation date or Exif' and is a File Renamer in the file management category. There are more than 50 alternatives to KRename for a variety of platforms, including Windows, Mac, Linux, Web-based and BSD apps. The best KRename alternative is Bulk Rename Utility. It's not free, so if you're looking for a free alternative, you could try Bulk Rename Utility or Ant Renamer. Other great apps like KRename are ReNamer, Keep It Shot, Rename X Pro and ScreenshotMagic.