unpkg

If you're looking for a simple and intuitive way to extract all files from a Mac OS X package, unpkg might just be what you need. This utility is easy to use and completely free under the GNU GPL license.

What makes unpkg so handy is that it allows you to unpack everything in the package into a folder with minimal effort. Just drag the package onto unpkg's icon, and it will handle the rest, extracting the contents into the same directory with the same name.

One thing to keep in mind is that unpkg is designed to be entirely non-invasive to your system. It only affects the folder where the unpacking takes place, and deliberately avoids moving any files around in your system. For this reason, it's not recommended to use unpkg for installing incremental OS X updates, for instance.

On the other hand, unpkg is perfect for anyone simply looking to get a kext, for example, from within the package. If this sounds like your situation, you can download unpkg without any worries and use it with confidence.