Package maker is a free tool developed by Apple. Using Package maker we can do re-packaging in MAC Os-X.

Using Package maker we can create .pkg file or .mpkg file from .app or .dmg file. Below is the link where I have explained in depth as how to do packaging in MAC using Package Maker snap shot method.

http://app2pack.blogspot.com/2015/07/mac-packaging-using-package-maker-snap.html