Image Renamer

From P12 Productions:

Simple easy to use program that lets rename many files at once. You can reorder the files before you rename. Select all or only some of the files in a folder to rename. A handy search feature will help you find them. Includes support for renaming file extensions. A single buffer is kept to recover the original filenames from the last try. Create new filenames or use wildcards to append to an existing filename. This version comes with a timeout feature after 20 days of use.