Free Mac batch image resizing software

Mac batch image resizing and conversion FAQs: How can I batch resize images or batch convert images on Mac OS X?

I was really pleased lately to discover I already had some free Mac batch image processing software already installed on my Mac computers. It turns out that the Mac Automator program from Apple was created with several "workflows" in mind, including several batch image processing workflows. With the Automator you can batch resize images, batch convert images file types, and batch create image thumbnails.