I use HTMLDOC. It's good solution for simple converting HTML to PDF. Also, I'd like suggest to use module HTML::HTMLDoc, which implements an object-oriented Perl interface to this programm.

But for build a commercial system which should generate some documents in different formats, I'd suggest to look at FOP. I've just looked over information about this tool and I hope that I will use it soon in my project for development system of documents circulation.

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