apple's package management tools

[Jude DaShiell]

What are Apple's package management tools for the mac?  The iTunes 
application is non-functional now and if this were debian I'd have done an 
aptitude remove --purge iTunes long ago.  For the uninitiated what 
aptitude remove --purge iTunes would do is to remove iTunes and everything 
iTunes uses on the system and purge all configuration files for all of 
those applications.  Libraries/frameworks as they're called in the windows 
world would also be removed.  Then with aptitude I could do aptitude 
install iTunes -r and reinstall iTunes and all of its dependencies 
cleanly.  Putting packages is not a good colution for package management 
problems that arise on the mac.  So I'm hoping some powerful package 
management tools are available even if I have to use the terminal to run 
them for this and other jobs.