utility simply unpacks all the files in a package. Very handy, and GNU GPL free too! Unpkg does not touch you system at all except for the folder where the unpacking takes places.

Because it does not move files around in your system (on purpose), you should not use unpkg to install, say, incremental OS X updates. But if you just need to get a kext from that package, for example, then unpkg is exactly what you need.

Requirements:
OS X 10.4.11-10.6
Universal Binary