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I created installers for a runtime app for a client in Feb of 2011.
On Windows, I used InnoIDE.
On Mac, I used Packages from developer Stephane Sudre.
I did originally try to use PackageMaker which is part of the OS X Developer file group, but found Packages to work better for me.
In both, you can specify what parts to install and what to leave out.
Hope this is helpful.