How to get an overview of the installed ports

[Ronald Hoellwarth]

Hello,

I've installed some apps and deinstalled them  again because I didn't 
like them. While installing them other software was installed too but 
I think it wasn't removed when I removed the unwanted programms.

Is there a possibility to get an overview which ports are installed and 
how they are linked? something like this:

appA
    needs appB appC
    needed by appD appE appF

appB
    needs -none-
    needed by appA

...

Then I could go through the list and see which programms I have to 
remove in order to get a cleaner system.

greetings from crailsheim, germany
ronald höllwarth

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