This question has been asked before.
Check the Q&A answer about UML diagrams here.
Perl isn't as advanced on OO modelling as C++/Java are, which have dozens of tools. Once I wanted to try the AutoDia tool under Windows and couldn't install it. If I'll have to draw class diagrams for my Perl code, I think I'll just take a regular UML modelling tool and draw diagrams by hand.
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