Do you know any good and easy application to make Installer Packages?
I've never used the Installer before and I don't really understand how to use it.
PackageMaker User Guide
Are your two apps separately launchable by the user? That is, is there a reason for the user to see two apps, and launch them separately? If not, then an app-within-an-app would be a better structure. Simply put the subsidiary app within the main app's Resources sub-dir. If all you need is two executables, then look inside the "Activity Monitor.app" in /Applications/Utilities/ and notice how it has a separately executable daemon file.