If you're looking for a tool to help you resize, convert or crop your images then ImageTools might be what you're looking for.
Image Tools is simple, yet powerful mass image customization app that will help you resize, convert, crop, flip / rotate your images. You can also add watermarks to your pictures.
Currentlly it offers support for the BMP, GIF, TIFF, JPEG and PNG image formats.
Product page: here