Batch File Renamer is a simple tool, that allows you to quickly rename all the files in a specified directory. You can remove spaces, replace spaces with underscore, Uppercase/lowercase file name, add a prefix/suffix...
BIMP Lite is a small and simple batch processor for image files, that allows you to perform various functions on multiple images. It can be used to create thumbnail images from your pictures, add a prefix/postfix, add a text...