alterPod is an application for extracting and replacing your iPod's strings and display graphics. alterPod can also backup and restore your iPod's firmware partition to your Mac's hard drive.
alterPod is actually a GUI for a command line program named ipodedit, written by Austin Che
You can edit strings in any text editor, as long as you save them as raw text files. To edit the extracted graphic files, you will need an Image Manipulation application that is capable of opening and saving *.PGM files (Portable GreyMap). May I suggest Graphic Converter?