iDump by Escsoft is a free piece of software that gives you the possibility to transfer music from your iPod to your computer. There is no information about the development of iDump for Mac, but there are many other apps that can help you with this task. If you are looking for an application that can help you transfer your entire iPod music collection to your system, then feel free to use any of the listed apps to replace iDump for Mac.
Feel free to add any alternative to iDump for Mac that you know of.
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And what's wrong doing the same thing using iTunes?